adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
average
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
axis
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
battery
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
behavioral adaptation
"Simple world map" by Tom-b [CC0 1.0] (brightened and continents removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
benefit/beneficial
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Cloud Overcast Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Smiley Face Smile" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Average" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-average-okay-3189736/
"Smiley Face Bad" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/
biofuels
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Oil Olive Greek" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/oil-olive-oil-greek-italian-olive-159855/
"Alga Algae Marine" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/alga-algae-marine-ocean-plant-sea-1299962/
canyon
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
carnivore
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
cementation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Glue Bottle Orange" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/glue-bottle-orange-blue-fluid-306757/
characteristic
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
closed/complete circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
cloud coverage
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
community
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
compaction
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
compete/competition
"Fighting Nyalas" by Papphase [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fighting_Nyalas.JPG
"Hyenas Fight Against Lions Over a Kill HD 12" by Kruger Sightings HD [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hyenas_Fight_Against_Lions_Over_a_Kill_HD_12.png
"Steenbock Kruger Deer" by WiseTraveller [CC0] (edges softened) via Pixabay https://pixabay.com/photos/steenbok-kruger-deer-antelope-1364425/
condensation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Glass Water Condensation" by Free-Photos [CC0] (cropped) via Pixabay https://pixabay.com/photos/glass-water-condensation-cold-ice-1209754/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove
conductor
"Enamelled litz copper wire" by Alisdojo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Enamelled_litz_copper_wire.JPG
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Anvil Red Hot" by BlenderUnknown [CC0] (cropped) via Pixabay https://pixabay.com/photos/anvil-red-hot-metal-steel-heat-1409639/ <Accessed 11/30/2021>>
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
crater
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Crater Volcano Hawaii Haleakala" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/crater-volcano-hawaii-1846775/
"Moon Craters Crater" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/moon-moon-craters-crater-508756/
decay/decompose/decomposition
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
decomposer/detritivore
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Tree Art Artwork" by OpenClipart-Vectorts [CC0] (rotated) via Pixabay https://pixabay.com/vectors/tree-art-artwork-trunk-cartoon-576866/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
delta
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (rotated) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Pile Rocks Dirt" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pile-rocks-dirt-heap-stack-rough-576448/<Accessed 2/20/2022>
dense/density
"Stone Rock" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/stone-rock-isolated-2010928/
"Pumice Stone and Rusty Bar" by Circe Denyer [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=244684&picture=pumice-stone-and-rusty-bar
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
dissolve/dissolution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
electric current
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated and cropped) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
electrical energy
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Power Station Current The Industry" by JerryGorecki [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Building House Home" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/building-house-home-construction-295215/
"Utility Pole Electrical Tower" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/utility-pole-electrical-tower-296441/
electricity
"Electric Cables Electrification Of" by pasja1000 [CC0] (cropped) via Pixabay https://pixabay.com/photos/electric-cables-electrification-of-3657404/
"Thunder Thunderstorm Violet" by ronomore [CC0] (cropped) via Pixabay https://pixabay.com/photos/thunder-thunderstorm-violet-purple-953118/
"Music Boxing Audio Equipment" by YoshisMom [CC0] (cropped) via Pixabay https://pixabay.com/vectors/music-boxing-audio-equipment-2923447/ <Accessed 11/30/2021>
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lamp-light-table-vector-2561267/ <Accessed 11/30/2021>
"Silhouette Musical Note" by mohamed_hassan [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-musical-note-clef-bass-3275055/ <Accessed 11/30/2021>
"Heater Warm Energy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/heater-warm-energy-heating-157783/ <Accessed 11/30/2021>
energy
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched, rotated, and cropped) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Cooking Pot Kitchen" by Titanium_Petal [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/cooking-pot-kitchen-stove-3311435/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg
"Amplification Demo Demonstration" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/amplification-demo-demonstration-1294300/
environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/
equator
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
evaporation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
flow
"Beach Ball Inflatable" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beach-ball-ball-inflatable-beach-575425/
"Sunset River Mountains" by deMysticWay [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sunset-river-mountains-sky-nature-2976428/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
flow of energy
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
food chain
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
food web
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
fossil
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lizard Gecko Dragon" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/lizard-gecko-dragon-animal-cartoon-23157/
"Dinosaur Lizard Fossil" by Petr Kratochvil [CC0] (cropped and rotated) via Needpix https://www.needpix.com/photo/1384234/dinosaur-lizard-fossil-old-ancient-stone-nature-rock-geology
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
fossil fuel
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Briquette Black Coal" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Briquette-Black-Coal-471903
"Drilling Oil Rig" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/drilling-oil-rig-pump-petroleum-36265/
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Fire Flames Heat" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fire-flames-heat-campfire-bonfire-1295306/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Tree Trunk Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-trunk-leaves-branches-nature-576847/ <Accessed 11/30/2021>
"Dinosaur Long Neck" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dinosaur-long-neck-walking-tail-45639/ <Accessed 11/30/2021>
"Brown Bird Flying" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brown-bird-flying-wings-dinosaur-45892/ <Accessed 11/30/2021>
freeze/freezing
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
friction
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/
function
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/
glacier
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Snow Snowy Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/snow-snowy-weather-clouds-dull-159390/
gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/
groundwater
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
herbivore
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
hibernation
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Snow Snowy Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/snow-snowy-weather-clouds-dull-159390/
humidity
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
ingredient
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
inherited trait
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
instinct
"Goat Eating Animal" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/goat-eating-animal-mammal-meadow-30806/
"Goat Animal Biology" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/goat-animal-biology-mammal-zoology-153826/
"For Reading Grandmother Grandchild" by dassel [CC0] (cropped) via Pixabay https://pixabay.com/photos/for-reading-grandmother-grandchild-752607/
"Fox Wolf Animal" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/fox-wolf-animal-biology-mammal-153450/
insulate/insulator/insulation
"Cables Wires The Combination Of" by jarmoluk [CC0] (cropped) via Pixabay https://pixabay.com/photos/cables-wires-the-combination-of-1080555/ <Accessed 8/30/2021>
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (recolored and rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/ <Accessed 8/30/2021>
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (recolored, rotated, and arm extended) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/ <Accessed 8/30/2021>
"The Kitchen Device Cooking" by simisi1 [CC0] (cropped) via Pixabay https://pixabay.com/vectors/the-kitchen-the-device-cooking-2638703/ <Accessed 8/30/2021>
"Fire Camp Bonfire" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fire-camp-bonfire-wood-heat-30231/ <Accessed 8/30/2021>
"Oven Mitt Red" by thegiwi [CC0] (rotated) via Pixabay https://pixabay.com/vectors/oven-mitten-red-protection-2814564/ <Accessed 8/30/2021>
"Anger Comic Angry" by GDJ [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anger-comic-angry-emoji-emoticon-1302159/ <Accessed 8/30/2021>
"Comic Emoji Emoticon" by CDJ [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/comic-emoji-emoticon-face-happy-1302161/ <Accessed 8/30/2021>
interaction
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Griffith experiment" by Madprime [CC0 1.0] (cropped and rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Griffith_experiment.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/
"Animal Shadow Tail" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/animal-shadow-tail-tongue-coyote-44780/
"Cave Hole" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cave-hole-mountain-145615/
interdependence
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Anemones Tentacle Sea" by Efraimstochter [CC0] (no alterations) via Pixabay https://pixabay.com/photos/anemones-tentacle-sea-anemones-793401/
"Home House Icons Jims" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/home-house-icons-jims-card-1294564/
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Soil Eart Poo" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/soil-eart-poo-brown-dirt-heap-576296/
landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png
learned behavior
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"For Reading Grandmother Grandchild" by dassel [CC0] (cropped) via Pixabay https://pixabay.com/photos/for-reading-grandmother-grandchild-752607/
"Books Library Education" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/books-library-education-literature-42701/
"Babe Smile Newborn Small" by Victoria_Borodinova [CC0] (cropped) via Pixabay https://pixabay.com/photos/babe-smile-newborn-small-child-boy-2972221/
"Malinois Belgian Shepherd Dog" by 825545 [CC0] (cropped) via Pixabay https://pixabay.com/photos/malinois-belgian-shepherd-dog-leaves-741416/
"Fawn and Black Belgian Malinois Puppy on Green Grass" by Pixabay [CC0] (cropped) via Pexels https://www.pexels.com/photo/fawn-and-black-belgian-malinois-puppy-on-green-grass-209115/
lens
"Ant Insect" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/ant-insect-animal-159283/
"Find Glass Magnifying" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/find-glass-magnifying-glass-search-148857/
light energy
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
living
"Plants Tiny Sprouty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-tiny-sprouty-green-leaves-576558/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Rock Boulder Stone" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-boulder-stone-nature-granite-576682/
magnetism
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
"Magnet Physics Magnetism" by yeTis [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4708072/
mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
matter
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (rotated and transparency filter applied) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Birthday Balloon Red" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/birthday-balloon-red-one-single-296558/
mechanical energy
"Forklift Lift Truck Industrial" by samuelchavelas [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/forklift-lift-truck-industrial-3337360/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg
medium
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Refraction photo" by ajizai [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
melt/melting
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
migration
"Simple world map" by Tom-b [CC0 1.0] (brightened) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (rotated, recolored and glow added) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flowers" by Karen Arnold [CC0 1.0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=111268&picture=dandelion-flowers
mimicry
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg
"Eagle Bird Animal" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eagle-bird-animal-flying-162195/
Untitled by Unknown [CC0] (cropped and rotated) via Pxhere https://pxhere.com/en/photo/86151
"coral, snake" by Luther C. Goldman, USFWS [CC0] (cropped) via Pixnio https://pixnio.com/fauna-animals/reptiles-and-amphibians/snakes-pictures/coral-snake
mirror
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Panorama Regensburg Historic" by FelixMittermeier [CC0] (cropped) via Pixabay https://pixabay.com/photos/panorama-regensburg-historic-center-2646143/
"Monkey Mirror Stare" by a_m_o_u_t_o_n [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/monkey-mirror-stare-thinking-3512996/
mixture
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Pile Heap Pyramid" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/pile-heap-pyramid-yellow-rocks-575648/
"Points Staples Colors Stops" by ElisaRiva [CC0] (cropped) via Pixabay https://pixabay.com/photos/points-staples-colors-stops-sheets-1859100/
model
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Fish Aquarium Sea" by visavietnam [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fish-aquarium-sea-fish-tank-288988/
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Crescent Moon Lunar" by Free-Photos [CC0] (brightness adjusted) via Pixabay https://pixabay.com/photos/crescent-moon-lunar-918793/
motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
needs
"Home House Icons Jims" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/home-house-icons-jims-card-1294564/
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Griffith experiment" by Madprime [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Griffith_experiment.svg
niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Earthworms The Frog’s Perspective After the Rain" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixels.net/Earthworms-After-The-Rain-The-Frogs-Perspective-2773457
non-living
"Plants Tiny Sprouty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-tiny-sprouty-green-leaves-576558/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Rock Boulder Stone" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-boulder-stone-nature-granite-576682/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cross Delete Remove" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cross-delete-remove-cancel-abort-296507/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
ocean
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
offspring
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Simple diagram of bacterium (blank)" by domdomegg [CC BY 4.0] (rotated and DNA removed) via Wikimedia Commons
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (recolored and brightness adjusted) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/
omnivore
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
open circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated, cropped and recolored) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
overpopulation
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
parallel circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
parent
"People Man Women" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/people-man-women-grandma-grandpa-4035403/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-male-animal-mammal-antlers-48417/
"Deer Animal Mammal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-animal-mammal-spots-resting-48419/
"Deer Animal Mammal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-animal-mammal-wild-nature-48421/
physical change
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
physical property
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159173/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
"Pyrite Pyrites Fools Gold Iron" by fill [CC0] (background removed) via Pixabay https://pixabay.com/photos/pyrite-pyrites-fools-gold-626549/
population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
precipitation
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
predator/prey
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
4.0] (rotated) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Blank_Calendar_page_icon.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
pressure
"Clamp Vice Grip" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/clamp-vice-grip-clasp-hold-tool-311532/
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
prism
"Refraction photo" by ajizai [Public Domain] (rotated and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png
"Light dispersion conceptual waves" by Lucas Vieira [Public Domain] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Light_dispersion_conceptual_waves.gif
producer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
property
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (contrast increased) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772
"Feather Blue Falling" by Yuri_B [CC0] (rotated and background removed) via Pixabay https://pixabay.com/vectors/feather-blue-falling-plume-flight-1689331/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/
pull
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
push
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
reflection
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
refraction
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Refraction photo" by ajizai [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png
revolve/revolution
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
role
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
rotate/rotation
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
sand dune
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
satellite
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Beach Sandy Paradise Palm" by Walkerssk [CC0] (cropped) via Pixabay https://pixabay.com/photos/beach-sandy-beach-paradise-1824855/
"Satellite Image Coast Coastline" by Free-Photos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-image-coast-coastline-1030781/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (rotated) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg
sedimentary rock
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174
series circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
shadow
"Tree Trunk Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-trunk-leaves-branches-nature-576847/ <Accessed 11/30/2021>
radiant/solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Solar Panel Array Roof Home" by skeeze [CC0] (no alterations) via Pixabay https://pixabay.com/photos/solar-panel-array-roof-home-house-1591358/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
soluble/solubility
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Pile Sand Powder" by OpenClipart-Vectors [CC0] (recolored and brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/pile-sand-powder-white-grains-576572/
solution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
sound energy
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Kettledrums Kettledrum Drummer" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kettledrums-kettledrum-drummer-37622/
species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/
structural adaptation
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Archibald Thorburn, Peacock and Peacock Butterfly, At 87.5 x 111.5cm. Bonhams." by Bonhams [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Archibald_Thorburn,_Peacock_and_Peacock_Butterfly,_At_87.5_x_111.5cm._Bonhams..jpg
"Anteater Ant Eater" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anteater-ant-eater-animal-giant-37870/
structure
Untitled by Unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1361285
"Needles Pine Needle" by zoosnow [CC0] (cropped) via Pixabay https://pixabay.com/en/needles-pine-needle-tree-spruce-3357001/
"Horse Hoof Black and White Animals" by GoranH [CC0] (cropped) via Pixabay https://pixabay.com/photos/horse-hoof-black-and-white-animal-3684503/
"Duck Feet" by makamuki0 [CC0] (cropped) via Pixabay https://pixabay.com/photos/duck-feet-web-footed-921102/
substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
Untitled by unknown [CC0] (cropped and recolored) via Pxhere https://pxhere.com/en/photo/666730
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
sunrise/sunset
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
survive/survival
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
switch
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/
temperature
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
texture
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Ribbon Purple" by Silhouette1 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/ribbon-purple-silk-2929380/
"Thumbtack Tack Pink" by iblushay [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/thumbtack-tack-pink-stationery-pin-496661/
thaw/thawing
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
tilt
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
transfer
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
transmit/transmission
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Apples Farmers Market Business" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/apples-farmers-market-business-buy-1841132/
valley
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Narrow Valley (4329975582)" by Afghanistan Matters [CC BY 2.0] (cropped) via Wikimedia commons https://commons.wikimedia.org/wiki/File:Narrow_Valley_(4329975582).jpg
"Watch for U-shaped valleys throughout the park" by Unknown [Public Domain] (cropped) via NPS https://www.nps.gov/glac/learn/nature/glacial-geology.htm
volume
"Measuring Glass Graduated Cylinder" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/measuring-glass-graduated-cylinder-152967/
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/
water cycle
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
water vapor
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched, rotated, and cropped) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Cooking Pot Kitchen" by Titanium_Petal [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/cooking-pot-kitchen-stove-3311435/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
weather
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
weight
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
wind direction
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Air Bag Wind Sock Weather" by MichaelGaida [CC0] (no alterations) via Pixabay https://pixabay.com/photos/air-bag-wind-sock-weather-sky-1857099/
wind speed
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
weathering
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Rock Gravel Passage" by Polymanu [CC0] (cropped) via Pixabay https://pixabay.com/photos/rock-gravel-passage-pebble-outdoor-1583561/
"Soil" by Mesaytsegaye [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
acceleration
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
Animalia
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Insects Various Insect" by divotomezove [CC0] (cropped) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/
"Snail Shell Slowly" by Momental [CC0] (no alterations) via Pixabay https://pixabay.com/photos/snail-shell-slowly-crawl-animal-2594139/
"Lemur Ring Tailed Primate" by skeeze [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemur-ring-tailed-lemur-primate-1045220/
"Kingfisher Bird Blue" by timoschluter [CC0] (cropped) via Pixabay https://pixabay.com/photos/kingfisher-bird-blue-plumage-1905255/
Archaea/archaebacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Champagne vent white smokers" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Champagne_vent_white_smokers.jpg
"Grand prismatic spring" by Jim Peaco, National Park Service [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Grand_prismatic_spring.jpg
asexual reproduction
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
asteroid
"Solar System Planet Planetary" by WikiImages [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/solar-system-planet-planetary-system-11111/
"Asteroid Meteorite Comet Shooting" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/asteroid-meteorite-comet-63125/
asthenosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
autotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"CSIRO ScienceImage 4203 A bluegreen algae species Cylindrospermum sp under magnification" by Willem van Aken, CSIRO [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_4203_A_bluegreen_algae_species_Cylindrospermum_sp_under_magnification.jpg
average speed
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
bacteria
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"DNA Infection Bacteria Bacterium Virus Cell" by Unknown [CC0] (recolored) via Max Pixel https://www.maxpixel.net/Dna-Infection-Bacteria-Bacterium-Virus-Cell-213708
"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
balanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
biofuels
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Oil Olive Greek" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/oil-olive-oil-greek-italian-olive-159855/
"Alga Algae Marine" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/alga-algae-marine-ocean-plant-sea-1299962/
biomass
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Compost Trash Waste" by Painter06 [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/compost-trash-waste-recycling-3340486/
biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/
brittle
"Euro 5 cent (Common face) (5131629928)" Mark Morgan [CC BY 2.0] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Euro_5_cent_(Common_face)_(5131629928).jpg
"Coin Money Specie" by fotoblend [CC0] (background removed) via Pixabay https://pixabay.com/photos/coin-money-specie-currency-2903302/
"Rubble Rocks Pile" by Jazella [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/rubble-rocks-pile-stones-junk-4283458/
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Charcoal Black Dark" by KenStock [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/charcoal-black-dark-grill-fire-5184954/
carbon
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Soil Layer Exposed" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/soil-layer-exposed-cover-grass-575641/
"Deer Silhouette Clipart" by Karen Arnold [CC0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=77626&picture=deer-silhouette-clipart
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Charcoal Garden Party Baking" by adonyig [CC0] (cropped and edges softened) via Pixabay https://pixabay.com/photos/charcoal-garden-party-baking-3550205/
cell
"Waterweed Plant Cell" by Vierschilling [CC0] (cropped) via Pixabay https://pixabay.com/photos/waterweed-plant-cell-mikroskopieren-1582259/
cementation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Glue Bottle Orange" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/glue-bottle-orange-blue-fluid-306757/
chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
chemical energy
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
chemical formula
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
chemical property
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
"Match Burning Fire" by Clker-Free-Vector-Images [CC0] (rotated and darkened) via Pixabay https://pixabay.com/vectors/match-burning-fire-lit-matchstick-30271/
chemical reaction
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
chemical symbol
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
comet
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Space Stars Comet" by Buddy_Nath [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/space-stars-comet-astronomy-1486556/
"Ice Crystal Chunks Of" by Hans [CC0] (cropped) via Pixabay https://pixabay.com/photos/ice-ice-crystal-chunks-of-ice-4444978/
community
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
compaction
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/
compositional layers
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Afwillite on rock Hydrous calcium silicate Crestmore Quarry Riverside California" by Dave Dyet [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Afwillite_on_rock_Hydrous_calcium_silicate_Crestmore_Quarry_Riverside_California.jpg
"Pyrite pyrites mineral" by stux [CC0] (no alterations) via Pixabay https://pixabay.com/photos/pyrite-pyrites-mineral-sulfide-345637/
compound
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Petrol Equipment Fire Extinguisher" by GulArt [CC0] (cropped) via Pixabay https://pixabay.com/photos/petrol-equipment-fire-extinguisher-3079094/
conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove
conductivity
"Sulfur-sample" by Ben Mills [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (background removed) via Images-of-Elements http://images-of-elements.com/boron.php
"Gold Nugget Natural" by PIX1861 [CC0] (background removed) via Pixabay https://pixabay.com/photos/gold-nugget-gold-nugget-2269846/
conservation/conserve
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Trucks Flatbed Trucking" by Clker-Free-Vector-Images [CC0] (cropped, recolored and rotated) via Pixabay https://pixabay.com/vectors/trucks-flatbed-trucking-vehicle-308567/
"Seedling Potted Plant Sapling" by OpenClipart-Vectors [CC0] (rotated and brightness adjusted) via Pixabay https://pixabay.com/vectors/seedling-potted-plant-sapling-plant-154735/
"Truck Box Car" by 200degrees [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/truck-box-car-vehicle-delivery-2181037/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
constant speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
convection
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
convergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
crust
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
dense/density
"Stone Rock" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/stone-rock-isolated-2010928/
"Pumice Stone and Rusty Bar" by Circe Denyer [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=244684&picture=pumice-stone-and-rusty-bar
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159173/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
displacement
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
distance
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
divergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
ductile/ductility
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"rope wing steel wire" by Unknown [CC0] (background removed and stretched) via Pxhere https://pxhere.com/en/photo/766047
"Circular Plates Metal" by artbaggage [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/circular-plates-metal-iron-837510/
earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/
ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
electric current
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated and cropped) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
electrical energy
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Power Station Current The Industry" by JerryGorecki [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Building House Home" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/building-house-home-construction-295215/
"Utility Pole Electrical Tower" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/utility-pole-electrical-tower-296441/
element
Untitled by unknown [CC0] (no alterations) via Pxhere https://pxhere.com/en/photo/666730
elliptical orbit
"Jupiter Planet Space" by TheDigitalArtist [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/jupiter-planet-space-astronomy-942558/
energy conversion/transformation
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Silhouette Running Run" by mohammed_hassan [CC0] (rotated) via Pixabay https://pixabay.com/vectors/silhouette-running-run-fast-3199472/
equilibrium
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
Eubacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
eukaryote
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Koli Bacteria Escherichia Coli" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/photos/koli-bacteria-escherichia-coli-123081/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
Fungi
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Unusual Bracket Fungi Yellow" by GeorgeB2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/unusual-bracket-fungi-yellow-rust-3811395/
"Lemon Rotten Fruit" by dimitrisvetsikas1969 [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemon-rotten-fruit-yellow-green-2146987/
geothermal
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Industry Factories Buildings" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/industry-factories-buildings-33663/
gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/
hardness
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Nail Hammer Tool" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/nail-hammer-tool-build-carpentry-147247/
"Diamond Shiny Baby" by EWAR [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/diamond-shiny-baby-wealth-wealthy-807979/
"Fluorite with Iron Pyrite" by Ryan Bushby [CC BY 2.5] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Fluorite_with_Iron_Pyrite.jpg
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg
heterotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
hydropower
"Japan Nagano Krobe" by funario [CC0] (cropped) via Pixabay https://pixabay.com/photos/japan-nagano-krobe-dam-2039620/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
igneous rock
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Ground rhyolite" by Doronenko [CC BY 3.0] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Ground_rhyolite.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
inclined plane
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
inner core
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Metal Balls Bearings" by LeoNeoBoy [CC0] (cropped) via Pixabay https://pixabay.com/photos/metal-balls-bearings-round-silver-1816561/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
kinetic energy
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Hurry Up Sport Silhouette" by mohamed_hassan [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hurry-up-sport-silhouette-speed-2785660/
lava
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
Law of Conservation of Energy/1st law of thermodynamics
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Cross Skull Danger" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cross-skull-danger-crossbones-296395/
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/
light energy
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
lithosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
luster
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg
"Graphite (Sri Lanka)" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/17364736943
"Sierra Grande Andesite" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/8455685503/sizes/o/in/set-72157632720256842/
"Pyrite Pyrites Fools Gold Iron" by fill [CC0] (background removed) via Pixabay https://pixabay.com/photos/pyrite-pyrites-fools-gold-626549/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
magma
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
magnetism
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
"Magnet Physics Magnetism" by yeTis [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4708072/
malleability/malleable
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Gold Nugget Natural" by PIX1861 [CC0] (background removed) via Pixabay https://pixabay.com/photos/gold-nugget-gold-nugget-2269846/
"Sulfur-sample" by Ben Mills [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Soufre/Sulphur/sulfur" by ComputerHotline [CC BY 3.0] (cropped and rotated) via OpenPhoto https://openphoto.net/gallery/image/view/10670
mantle
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
mechanical energy
"Forklift Lift Truck Industrial" by samuelchavelas [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/forklift-lift-truck-industrial-3337360/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg
mechanical layers
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
metal
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Copper (29 Cu)" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Copper_(29_Cu).jpg
metalloid
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Images-of-Elements http://images-of-elements.com/boron.php
metamorphic rock
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Foliated metamorphic gneiss" by Tim Connors [Public Domain] (background removed) via National Park Service https://www.nps.gov/subjects/geology/metamorphic.htm
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174
meteor
"Asteroid Meteorite Comet Shooting" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/asteroid-meteorite-comet-63125/
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Dark Darkness Meteor" by OpenClipart-Vectors [CC0] (cropped and brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/dark-darkness-meteor-night-2024127/
mid‐ocean ridge
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"World Map" by Clker-Free-Vector-Images [[CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/
Untitled by NOAA [Public Domain] (no alterations) via NOAA https://oceanservice.noaa.gov/facts/midoceanridge.html
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
mineral
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Crystal Quartz Transparency" by uhi_noko812 [CC0] (background removed) via Pixabay https://pixabay.com/photos/crystal-quartz-transparency-stone-860840/
Moh’s Scale of Hardness
"Mohs" by National Park Service [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mohs.jpg
motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
multicellular
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Trichia Decipiens Slime Mold Single Celled Organisms" by unknown [CC0] (cropped and brightened) via Max Pixel https://www.maxpixel.net/Trichia-Decipiens-Slime-Mold-Single-Celled-Organisms-2793201
nonmetal
"Sulfur-sample" by Ben Mills [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772
non-renewable resource
"Rubble Rocks Pile" by Jazella [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/rubble-rocks-pile-stones-junk-4283458/
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Drilling Oil Rig" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/drilling-oil-rig-pump-petroleum-36265/
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
nuclear power
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Power Plant Nuclear" by JamesQube [CC0] (cropped) via Pixabay https://pixabay.com/photos/power-plant-nuclear-power-2899861/
"Radioactivity Radioactive Symbol" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/radioactivity-radioactive-symbol-35721/
*Energy output information from: https://www.energy.gov/ne/articles/nuclear-power-most-reliable-energy-source-and-its-not-even-close#:~:text=Nuclear%20Has%20The%20Highest%20Capacity%20Factor&text=This%20basically%20means%20nuclear%20power,than%20wind%20and%20solar%20plants.
nucleus (cellular)
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored and cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Onion cells" by kaibara87 [CC BY 2.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Onion_Cells.jpg
ocean basin
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/
outer core
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Sparks Molten Metal" by wetaft [CC0] (cropped) via Pixabay https://pixabay.com/photos/sparks-molten-metal-hot-iron-687092/
physical property
"Pyrite Pyrites Fools Gold Iron" by fill [CC0] (background removed) via Pixabay https://pixabay.com/photos/pyrite-pyrites-fools-gold-626549/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
planet
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Galilean Monde" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/jupiter-planet-galilean-monde-io-11615/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Jupiter Planet Space" by TheDigitalArtist [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/jupiter-planet-space-astronomy-942558/
Plantae
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Eze jardin exotique" by Berthold Werner [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Eze_jardin_exotique.JPG
"Change Lake Grass" by telix2000 [CC0] (cropped) via Pixabay https://pixabay.com/photos/change-lake-grass-river-green-1931997/
"Tree Dawn Nature" by danfador [CC0] (cropped) via Pixabay https://pixabay.com/photos/tree-dawn-nature-bucovina-romania-338211/
population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
position
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
"CCD5-8.5x11" by City of San Antonio [Public Domain] (cropped) via SanAntonio.gov https://www.sanantonio.gov/Portals/0/Files/GIS/PoliticalMaps/CCD5-8.5x11.pdf
potential energy
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Metal spring vector drawing" by Openclipart [CC0] (spring compressed) via PublicDomainVectors https://publicdomainvectors.org/en/free-clipart/Metal-spring-vector-drawing/26682.html
precipitate
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
pressure
"Clamp Vice Grip" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/clamp-vice-grip-clasp-hold-tool-311532/
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
prokaryote
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
protist/Protista
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Chondrus crispus - Köhler–s Medizinal-Pflanzen-034" by Franz Eugen Köhler, Köhler's Medizinal-Pflanzen [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Chondrus_crispus_-_K%C3%B6hler%E2%80%93s_Medizinal-Pflanzen-034.jpg
pure substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
radiation
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/ <Accessed 12/6/2021>
"Drink Coffee Tea" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/drink-coffee-tea-beverage-156158/ <Accessed 12/6/2021>
renewable resource
"Seedling Potted Plant Sapling" by OpenClipart-Vectors [CC0] (rotated and brightness adjusted) via Pixabay https://pixabay.com/vectors/seedling-potted-plant-sapling-plant-154735/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576847/
"Shovel Trowel Digging" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/shovel-trowel-digging-equipment-575661/
resource
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Association Community Group" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/association-community-group-meeting-152746/
revolve/revolution
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
rock cycle
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
rotate/rotation
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
seafloor spreading
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Pumice Stone Structure" by stux [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/photos/pumice-stone-pumice-structure-fund-186302/
sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg
sedimentary rock
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174
sexual reproduction
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
solar power
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/
speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
streak
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg
"Hematite streak plate" by KarlaPanchuk “[CC BY-SA 4.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hematite_streak_plate.jpg
subscript
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/
substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
Untitled by unknown [CC0] (cropped and recolored) via Pxhere https://pxhere.com/en/photo/666730
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
tectonic plates
"World Map" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/
temperature
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
transfer
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Drink Coffee Tea" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/drink-coffee-tea-beverage-156158/
transform boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Transform fault-1" by Los688 [Public Domain] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Transform_fault-1.svg
unbalanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
unicellular
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Koli Bacteria Escherichia Coli" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/photos/koli-bacteria-escherichia-coli-123081/
volcano
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
volume
"Measuring Glass Graduated Cylinder" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/measuring-glass-graduated-cylinder-152967/
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/
weathering
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Rock Gravel Passage" by Polymanu [CC0] (cropped) via Pixabay https://pixabay.com/photos/rock-gravel-passage-pebble-outdoor-1583561/
"Soil" by Mesaytsegaye [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
allele
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
ancestor
"Tapir Animal Baird’S Tapirus" by OpenClipart-Vectors [CC0] (rotated and recolored) via Pixabay https://pixabay.com/vectors/tapir-animal-baird-s-tapir-153797/
"Horseevolution" by Mcy jerry at English Wikipedia [CC BY-SA 3.0] (cropped, rotated and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Horseevolution.png
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
aquifer
"Power Station Current The Industry" by JerryGorecki [CC0] (recolored) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Brooklyn New York Skyline" by GDJ [CC0] (cropped) via Pixabay https://pixabay.com/vectors/brooklyn-new-york-skyline-cityscape-2858985/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Waste Scrap Metal Rust" by Juhele [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/waste-scrap-metal-rust-mould-can-4326821/
asexual reproduction
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
autotroph
"CSIRO ScienceImage 4203 A bluegreen algae species Cylindrospermum sp under magnification" by Willem van Aken, CSIRO [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_4203_A_bluegreen_algae_species_Cylindrospermum_sp_under_magnification.jpg
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (rotated) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
behavior
"Bat Flying Wings" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bat-flying-wings-halloween-fear-47821/
"Barbary Ape Eat Apple Endangered" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/barbary-ape-eat-apple-3538256/
"Fox Sleeping Resting" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fox-sleeping-resting-relaxing-red-1284512/
"Bird Singer Singing" by TeeFarm [CC0] (tone adjusted) via Pixabay https://pixabay.com/photos/bird-singer-singing-chirp-tweet-2119874/
"Cat Bristling Fight" by ivabalk [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-bristling-fight-preparation-4164689/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
biodiversity
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
biological weathering
"Soil" by Mesaytsegaye [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
Untitled by unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1369678
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
biome
"Biomes of the world" by Terpsichores [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Biomes_of_the_world.svg
"Bamboo Jungle Tropical Bamboo Forest" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixel.net/Bamboo-Jungle-Tropical-Bamboo-Forest-1167317
"Sun Desert Arid Joshua Tree California Dry" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixel.net/Sun-Desert-Arid-Joshua-Tree-California-Dry-3008332
"Rocky Mountain National Park –Tundra" by Roger W [CC BY-SA 2.0] (cropped) via Flickr https://www.flickr.com/photos/24736216@N07/4016097359
biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/
blood vessel
"Circulatory System no tags" by LadyofHats [Public Domain] (cropped) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Anatomy Blood Vessel" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/anatomy-blood-vessel-red-156854/
carbon dioxide
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Air Pollution Factory Industry" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/air-pollution-factory-industry-149241/
catastrophic event
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Bare Leafless Plant" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bare-leafless-plant-tree-winter-1297449/
"Storm Stormy Tornado" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/storm-stormy-tornado-weather-159391/
"Tree Log Fallen" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-log-fallen-cartoon-nature-576846/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Green Plants Flowers" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-flowers-greenery-576278/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/
cell
"Waterweed Plant Cell" by Vierschilling [CC0] (cropped) via Pixabay https://pixabay.com/photos/waterweed-plant-cell-mikroskopieren-1582259/
cell membrane
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (protein channels isolated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg
cell wall
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
characteristic
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
chemical digestion
"Digestive system without labels" by LadyOfHats [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
Apple Slice Fruit by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
chemical energy
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
chemical weathering
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Mother Allen Hexagon Nut" by AlexanderStein [CC0] (cropped) via Pixabay https://pixabay.com/photos/mother-allen-hexagon-nut-rust-173739/
"Nut Screw Macro" by videofan2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/nut-screw-macro-reflections-metal-2051596/
"Weathering Limestone State College PA" by Jtsuby [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Weathering_Limestone_State_College_PA.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
chlorophyll
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/
"Chlorophyll-c2-3D-balls" by Jynto [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Chlorophyll-c2-3D-balls.png
chloroplast
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/
chromosome
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
circulatory system
"Truck Delivery Box Vehicle Car Transport Shipping" by Unknown [CC0] (cropped and recolored) via Max Pixel https://www.maxpixel.net/Truck-Delivery-Box-Vehicle-Car-Transport-Shipping-2181037
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
classify/classification
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
climax community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/
compound
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
cytoplasm
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
decomposer/detritivore
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Tree Art Artwork" by OpenClipart-Vectorts [CC0] (rotated) via Pixabay https://pixabay.com/vectors/tree-art-artwork-trunk-cartoon-576866/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
descend/descendant/descent
"Homo habilis-2" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) “[CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_habilis-2.JPG
"Homo erectus new" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) “[CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_erectus_new.JPG
"Homo heidelbergensis - forensic facial reconstruction-crop" by Cicero Moraes [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_heidelbergensis_-_forensic_facial_reconstruction-crop.png
Untitled by U.S. Army [Public Domain] (cropped) via U.S. Army https://www.army.mil/article/45790/picatinny_engineer_earns_dod_recognition_for_service_to_nj_hispanic_community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
dichotomous key/identification key
"Insects Various Insect" by divotomezove [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/
digestive system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Apple Slice Fruit" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/
diversity/diverse
"Maize Field Corn" by GraphicsSC [CC0] (brightened) via Pixabay https://pixabay.com/photos/maize-field-corn-field-1001106/
"Corn Market Hazelnut" by GregReese [CC0] (no alterations) via Pixabay https://pixabay.com/photos/corn-market-hazelnut-agriculture-3229230/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
DNA (deoxyribonucleic acid)
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Genetics Chromosome Rna" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/genetics-chromosomes-rna-dna-156404/
dominant
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/
dormancy
"Onion Vintage Drawing" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/onion-vintage-drawing-old-2933406/
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
drought
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/
ecological succession
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
endocrine system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Airmail Envelope Back View" by Karen Arnold [CC0] (rotated) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=42544&picture=airmail-envelope-back-view
energy conversion/transformation
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Silhouette Running Run" by mohammed_hassan [CC0] (rotated) via Pixabay https://pixabay.com/vectors/silhouette-running-run-fast-3199472/
energy pyramid
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/
erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
evaporation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
excretion
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Trash Waste Recycling" by Painter06 [CC0] (no alterations) via Pixabay https://pixabay.com/en/trash-waste-recycling-recyclable-3323974/
"Urinary system" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Urinary_system.gif
excretory system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Trash Waste Recycling" by Painter06 [CC0] (rotated) via Pixabay https://pixabay.com/en/trash-waste-recycling-recyclable-3323974/
"Urinary system" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Urinary_system.gif
external
"Box Open Cardboard" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/box-open-cardboard-box-cardboard-152428/
feature
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/
"Beetle Rhino Insect" by Romario99 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/beetle-rhino-insect-nature-macro-4488578/
feedback loop/mechanism
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
flood
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
flow of energy
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
food chain
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
food web
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
function
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/
gene
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
generation
"People Man Women" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/people-man-women-grandma-grandpa-4035403/
genetics/heredity
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
genotype
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/
geotropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Development Germinating" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
glucose
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
groundwater
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
habitat
"Forest Fern Nature" by Bieniu94 [CC0] (cropped) via Pixabay https://pixabay.com/en/forest-fern-nature-photo-picture-3492362/
"Polar Bear Snow Predator" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/en/polar-bear-snow-predator-cold-3629687/
"Desert tortoise (Gopherus agassizii)" by Robb Hannawacker [CC0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Desert_tortoise_(Gopherus_agassizii).jpg
"House Home White" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/house-home-white-shapes-chimney-48764/
heterotroph
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
heterozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
hibernation
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Snow Snowy Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/snow-snowy-weather-clouds-dull-159390/
homeostasis
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
homozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
hurricane
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"GOES-16 image of hurricanes Katia, Irma and Jose on September 8, 2017" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:GOES-16_image_of_hurricanes_Katia,_Irma_and_Jose_on_September_8,_2017.jpg
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
integumentary system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html
internal/interior
"Box Open Cardboard" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/box-open-cardboard-box-cardboard-152428/
landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png
landslide
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
limiting factor
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Background Border Grass" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/background-border-grass-green-herb-2029768/
matter
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (rotated and transparency filter applied) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Birthday Balloon Red" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/birthday-balloon-red-one-single-296558/
mechanical digestion
"Digestive system without labels" by LadyOfHats [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Red apple" by James Birkett [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Red_apple.svg
mechanical weathering
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
metabolism/metabolic activity
"Red apple" by James Birkett [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Red_apple.svg
migration
"Simple world map" by Tom-b [CC0 1.0] (brightened) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (rotated, recolored and glow added) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flowers" by Karen Arnold [CC0 1.0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=111268&picture=dandelion-flowers
mitochondria/mitochondrion
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
molecule
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
muscular system
"2006 Heart Musculature" by OpenStax College [CC BY 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:2006_Heart_Musculature.jpg
"1021 Smooth Muscle new" by OpenStax [CC BY 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:1021_Smooth_Muscle_new.jpg
"Muscular system" by Termininja [CC BY-SA 3.0] (no alternations) via Wikimedia Commons https://upload.wikimedia.org/wikipedia/commons/archive/1/13/20120816180041%21Muscular_system.svg
"Skeletal muscle" by Unknown [CC0 1.0] (cropped and rotated) via FreeSVG https://freesvg.org/skeletal-muscle
"Bone Leg Femur" by b0red [CC0] (cropped) via Pixabay https://pixabay.com/vectors/bone-leg-bone-femur-human-medical-2937723/
mutation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
natural selection
"Nature Tree Orange" by Gellinger [CC0] (trunk elongated and cropped) via Pixabay https://pixabay.com/photos/nature-tree-orange-orange-tree-2444640/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/
nervous system
"Nervous system diagram unlabeled" by Medium69 and Jmarchn “[CC BY-SA 4.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Nervous_system_diagram_unlabeled.svg
niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Earthworms The Frog’s Perspective After the Rain" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixels.net/Earthworms-After-The-Rain-The-Frogs-Perspective-2773457
nucleus (cellular)
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored and cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Onion cells" by kaibara87 [CC BY 2.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Onion_Cells.jpg
offspring
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (recolored and brightness adjusted) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/
organ
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"The Larynx Pharynx Anatomy" by ikkilacerda [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-larynx-the-pharynx-anatomy-2381980/
"Liver Organ Anatomy" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/liver-organ-anatomy-brown-3332302/
organ system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed and cropped) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/
organelle
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/
organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/
oxygen
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
percolate
"Background Border Grass" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/background-border-grass-green-herb-2029768/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
phenotype
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/
"Maple Leaf Green" by Sweetaholic [CC0] (no alterations) via Pixabay https://pixabay.com/photos/maple-leaf-green-maple-leaf-tree-888807/
phloem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
photosynthesis
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
phototropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
physical change
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
pioneer species
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Figure 45 06 16" by CNX OpenStax [CC BY 4.0] (cropped and panel added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Figure_45_06_16.jpg
pollution
"Power Station Current The Industry" by JerryGorecki [CC0] (recolored) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Brooklyn New York Skyline" by GDJ [CC0] (cropped) via Pixabay https://pixabay.com/vectors/brooklyn-new-york-skyline-cityscape-2858985/
"Waste Scrap Metal Rust" by Juhele [CC0] (brightness adjusted) via Pixabay https://pixabay.com/vectors/waste-scrap-metal-rust-mould-can-4326821/
"Blue Car Road" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/blue-car-road-transportation-drive-24358/
"Car Vehicle Transport" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/car-vehicle-transport-automotive-24315/
"Cross Skull Danger" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cross-skull-danger-crossbones-296395/
precipitation
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
primary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
producer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
proximity
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
purebred
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/
radiant/solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
recessive
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/
reproductive system
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453
respiratory system
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/
response
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/
secondary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg
seedling
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
selective breeding
"Puppy Bulldog Dog" by vlaaitje [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-bulldog-dog-sweet-pet-1118584/
"Eurasians Medium Spitz-Like" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/eurasians-medium-spitz-like-dog-2735337/
"Wolf Wild Animal World" by Alexas_Fotos [CC0] (cropped) via Pixabay https://pixabay.com/photos/wolf-wild-animal-animal-world-3151876/
"Mexican Wolf 2 yfb-edit 1" by Clark, Jim (U.S. Fish and Wildlife Service) [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Mexican_Wolf_2_yfb-edit_1.jpg
"Zoo Wolf Wild" by 35030 [CC0] (cropped) via Pixabay https://pixabay.com/photos/zoo-wolf-wild-mammal-animal-111178/
"German Shepherd Pet Portrait" by JeanineW [CC0] (cropped) VIA Pixabay https://pixabay.com/photos/german-shepherd-pet-portrait-dogs-3770786/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg
"Stop Containing Street Sign" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stop-containing-street-sign-1013732/
sexual reproduction
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Restroom Bathroom Sign" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/restroom-bathroom-sign-ladies-304987/
skeletal system
"Human skeleton back no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_back_no-text_no-color.svg
"Human skeleton front no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_front_no-text_no-color.svg
species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/
stability/stable
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
stimulus/stimuli
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/
structure
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
Untitled by Unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1361285
"Needles Pine Needle" by zoosnow [CC0] (cropped) via Pixabay https://pixabay.com/en/needles-pine-needle-tree-spruce-3357001/
surface water
"Cattails Bulrush Marsh" by plume93 [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cattails-bulrush-marsh-nature-4257085/
sustainability
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
terrestrial
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Worm Earthworm Nightcrawler" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/worm-earthworm-nightcrawler-37662/
"Hornet Wasp Insect" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hornet-wasp-insect-bee-brown-151003/
thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
thigmotropism
"Vine" by Jon Sullivan [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Vine.jpg
"Fly Housefly Macro Close" by TBIT [CC0] (background removed) via Pixabay https://pixabay.com/photos/fly-housefly-macro-close-up-insect-946712/
"Venus Fly Trap Carnivorous" by jemmaliggett13 [CC0] (cropped) via Pixabay https://pixabay.com/photos/venus-fly-trap-fly-carnivorous-4606879/
"Insect Venus Fly Trap" by Isbbohn [CC0] (cropped) via Pixabay https://pixabay.com/photos/insect-venus-fly-trap-plant-1535990/
tissue
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Muscle Tissue: Smooth" by Berkshire Community College Bioscience Image Library [CC0 1.0] (cropped) via Flickr https://www.flickr.com/photos/146824358@N03/40087100490/
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"magnification, 500x, hematoxyllin, eosin, lung, tissue, sample" by Dr. Brachman, USCDCP [Public Domain] (cropped) via Pixnio https://pixnio.com/science/microscopy-images/plague-yersenia-pestis/magnification-of-500x-this-hematoxylin-and-eosin-stained-he-lung-tissue-sample
tornado
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Storm Stormy Tornado" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/storm-stormy-tornado-weather-159391/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
trait
"Dog Pet Hovawart" by Chiemsee2016 [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-pet-hovawart-black-1194087/
"Husky Dog Breed" by pixel2013 [CC0] (cropped) via Pixabay https://pixabay.com/photos/husky-dog-dog-breed-animal-3380548/
"Dog Animal Portrait" by Vizsalafotozas [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-animal-portrait-pet-brown-3277416/
transfer
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
trophic level
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
tsunami
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
vacuole
"Turgor pressure on plant cells diagram" by LadyofHats [Public Domain] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Turgor_pressure_on_plant_cells_diagram.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
variation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
volcano
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
vomiting
"Symptoms-vomiting" by CDC [Public Domain] (no alterations) via https://commons.wikimedia.org/wiki/File:Symptoms-vomiting.jpg
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg
water table
"Wishing Well Cartoon" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/well-wishing-well-cartoon-water-38107/
watershed
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted and) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
wildfire
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Bare Leafless Plant" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bare-leafless-plant-tree-winter-1297449/
wilting
"Fungal wilt of papaya: Wilting, chlorosis and necrosis" by Scot Nelson [Public Domain] (cropped) via https://www.flickr.com/photos/scotnelson/9178775090
"Leaf Papaya Green" by thiagolazarino [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/leaf-papaya-green-nature-leaves-4763700/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
xylem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
absolute magnitude
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
abundance
"Cart Shopping Supermarket" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/cart-shopping-supermarket-148964/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
acceleration
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
air mass
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (brightened and cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
apparent magnitude
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Astronomy Space Telescope" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/astronomy-space-telescope-universe-1294337/
applied force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
artificial reef
"Artificialreef" by Polylerus [Public Domain] (cropped and human removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Artificialreef.JPG
"Coral Collage Vintage" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/coral-collage-vintage-plant-blue-1653752/
"Fish Collage Vintage" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/fish-collage-vintage-ocean-life-1653751/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
asthenosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
atom
"Lithium Atom Isolated" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
atomic mass
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
atomic number
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
average speed
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
axis
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
balanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
Big Bang theory
"Hubble Team Unveils Most Colorful View of Universe Captured by Space Telescope" by NASA Goddard [Public Domain] (cropped) via NASA https://images.nasa.gov/details-GSFC_20171208_Archive_e001061.html
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
biodiversity
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/
Bohr model
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
brightness/luminosity
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Planet Sun" by ipicgr [CC0] (resized and brightened) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Light Bulb Clip Art Idea" by ArtsyBee [CC0] (brightness altered) via Pixabay https://pixabay.com/illustrations/light-bulb-clip-art-idea-1139405/
camouflage
"Peppered Moth (Biston betularia)" by Ben Sale [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/33398884@N03/5857613284
"Katydid Grasshopper" by Brett_Hondow [CC0] (no alterations) via Pixabay https://pixabay.com/photos/katydid-grasshopper-leaf-grasshopper-449194/
canyon
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
carnivore
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
celestial body
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Astronomy Space Telescope" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/astronomy-space-telescope-universe-1294337/
"Milky Way Starry Sky Star" by Hans [CC0] (cropped) via Pixabay https://pixabay.com/photos/milky-way-starry-sky-star-galaxies-1655504/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Mars Red Planet Starry" by WikiImages [CC0] (background removed) via Pixabay https://pixabay.com/photos/mars-red-planet-planet-starry-sky-11012/
"Sun Fireball Solar Flare" by WikiImages [CC0] (background removed) via Pixabay https://pixabay.com/photos/sun-fireball-solar-flare-sunlight-11582/
"Space Stars Photoshop" by 1980supra [CC0] (background removed) via Pixabay https://pixabay.com/photos/space-stars-photoshop-nebula-1436951/
chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
chemical formula
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
chemical property
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
"Match Burning Fire" by Clker-Free-Vector-Images [CC0] (rotated and darkened) via Pixabay https://pixabay.com/vectors/match-burning-fire-lit-matchstick-30271/
chemical reaction
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
chemical symbol
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
coefficient
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/
cold front
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
compete/competition
"Fighting Nyalas" by Papphase [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fighting_Nyalas.JPG
"Hyenas Fight Against Lions Over a Kill HD 12" by Kruger Sightings HD [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hyenas_Fight_Against_Lions_Over_a_Kill_HD_12.png
"Steenbock Kruger Deer" by WiseTraveller [CC0] (edges softened) via Pixabay https://pixabay.com/photos/steenbok-kruger-deer-antelope-1364425/
composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/
compound
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove
constant speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
constant velocity
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
Continental Drift theory
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
Untitled by Unknown [Public Domain] (cropped) via USGS https://pubs.usgs.gov/gip/dynamic/historical.html
contour interval
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
convection current
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
convergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
Coriolis effect
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
crater
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Crater Volcano Hawaii Haleakala" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/crater-volcano-hawaii-1846775/
"Moon Craters Crater" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/moon-moon-craters-crater-508756/
crust
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
depend/dependent/dependence
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Animal Bear Collection" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/animal-bear-collection-silhouettes-1297864/
"Tortoise Feeding Animal" by MemoryCatcher [CC0] (no alterations) via Pixabay https://pixabay.com/photos/tortoise-feeding-animal-wildlife-2311869/
"Smiley Face Smile" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
displacement
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
dissolve/dissolution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
distance
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
divergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/
eclipse
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Solar Eclipse Sun Flare" by Buddy_Nah [CC0] via Pixabay https://pixabay.com/photos/solar-eclipse-sun-flare-solar-1482921/
"Moon Astronomy Luna" by ktphotography [CC0] via Pixabay https://pixabay.com/photos/moon-astronomy-luna-lunar-eclipse-3182407/
ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
El Niño
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Map of the Pacific region" by Inductiveload [Public Domain] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Map_of_the_Pacific_region.svg
electrical charge
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
electromagnetic radiation
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Lithium Atom Isolated" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Electromagnetic Waves Wave-Length" by helder100 [CC0] (cropped) via Pixabay https://pixabay.com/vectors/electromagnetic-waves-wave-length-1526374/
electromagnetic spectrum
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Broadcast Tower Radio" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/broadcast-tower-radio-wave-297434/
"Microwave Appliance Cooking" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/microwave-appliance-cooking-oven-29109/
"Infrared image of a cow" by Craig Packer acquired from USDA ARS [Public Domain] (no alterations) via Pixabay http://www.freestockphotos.biz/stockphoto/10090
"UV light detection" by Airman st Class Micaiah Anthony [Public Domain] (cropped and brightened) via US Air Force https://www.acc.af.mil/News/Art/igphoto/2000150965/
"Diagnosis Xray Chest" by oracast [CC0] (no alterations) via Pixabay https://pixabay.com/photos/diagnosis-xray-chest-lungs-ribs-1476620/
electron
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
electron cloud
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
element
Untitled by unknown [CC0] (no alterations) via Pxhere https://pxhere.com/en/photo/666730
elevation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
energy level
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
equator
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
equinox
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
extinct/extinction
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Frog Amphibian Tropical" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/frog-amphibian-tropical-rainforest-46403/
family/group (Periodic Table)
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
fault
"Piqiang Fault, China detail" by Robert Simmon and Jesse Allen, NASA Earth Observatory [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Piqiang_Fault,_China_detail.jpg
"Aerial-SanAndreas-CarrizoPlain" by John Wiley [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Aerial-SanAndreas-CarrizoPlain.jpg
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
feature
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/
"Beetle Rhino Insect" by Romario99 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/beetle-rhino-insect-nature-macro-4488578/
fertilizer
"Sapling Plant Growing" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/sapling-plant-growing-seedling-154734/
"Garden Pot Fertilizer Seeds" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/garden-pot-fertilizer-seeds-4290627/
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/
force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
fossil
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lizard Gecko Dragon" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/lizard-gecko-dragon-animal-cartoon-23157/
"Dinosaur Lizard Fossil" by Petr Kratochvil [CC0] (cropped and rotated) via Needpix https://www.needpix.com/photo/1384234/dinosaur-lizard-fossil-old-ancient-stone-nature-rock-geology
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
frequency
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
friction
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/
frictionless
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/
galaxy
"Messier 81 HST" by NASA, ESA and the Hubble Heritage Team (STScI/AURA) [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Messier_81_HST.jpg
"Hubble Views a Young Elliptical Galaxy (22754376897)" by NASA Goddard Space Flight Center [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hubble_Views_a_Young_Elliptical_Galaxy_(22754376897).jpg
"Irregular galaxy NGC 1427A (captured by the Hubble Space Telescope)" by NASA, ESA and the Hubble Heritage Team (STScI/AURA) [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg
acceleration due to gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
hemisphere
"Rotating earth (huge)" by The MP [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
herbivore
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
Hertzsprung‐Russell diagram
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
host
"Remora and shark" by Brian Snelson [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/exfordy/2950573720
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/
humidity
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
hurricane
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"GOES-16 image of hurricanes Katia, Irma and Jose on September 8, 2017" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:GOES-16_image_of_hurricanes_Katia,_Irma_and_Jose_on_September_8,_2017.jpg
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
inertia
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
jet stream
"Jet streams occur in both hemipsheres." by Unknown [Public Domain] (recolored and labels removed) via US Dept of Commerce https://www.weather.gov/jetstream/jet
"North hemisphere cross section showing jet streams and tropopause elevations." by Unknown [Public Domain] (recolored and labels removed) via US Dept of Commerce https://www.weather.gov/jetstream/jet
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
La Niña
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Map of the Pacific region" by Inductiveload [Public Domain] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Map_of_the_Pacific_region.svg
landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png
Law of Action-Reaction
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
"Rocket Missile Lift-Off" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rocket-missile-lift-off-start-fire-146104/
"Button The Icon Web" by 1117826 [CC0] (rotated and recolored) via Pixabay https://pixabay.com/vectors/button-the-button-icon-web-pages-850101/
Law of Conservation of Mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
Law of Force and Acceleration
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/
Law of Inertia
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/
light wave
"Rainbow Faded Colors" by Modman [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rainbow-faded-colors-colorful-772324/
"Man Standing Person" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/man-standing-person-male-adult-309030/
"Bush Green Shrub" by OpenClipart-Vectors [CC0] (darkened) via Pixabay https://pixabay.com/vectors/bush-green-shrub-grass-lush-plant-575513/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Illumination Lamp Obsolete Old" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/illumination-lamp-obsolete-1296362/
lithosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
long‐term environmental change
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Squirrel Animal" by harshal07 [CC0] (rotated) via Pixabay https://pixabay.com/vectors/squirrel-animal-pet-1456764/
"Lab Mouse Science" by mcmurryjulie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lab-mouse-mouse-science-lab-animal-1471870/
"Mouse Gray Small" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-gray-small-animal-tail-48374/
lunar cycle
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Astronomy Space Telescope" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/astronomy-space-telescope-universe-1294337/
magma
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
mass number
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
metal
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Copper (29 Cu)" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Copper_(29_Cu).jpg
metalloid
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Images-of-Elements http://images-of-elements.com/boron.php
mid‐ocean ridge
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"World Map" by Clker-Free-Vector-Images [[CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/
Untitled by NOAA [Public Domain] (no alterations) via NOAA https://oceanservice.noaa.gov/facts/midoceanridge.html
model
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Fish Aquarium Sea" by visavietnam [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fish-aquarium-sea-fish-tank-288988/
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Crescent Moon Lunar" by Free-Photos [CC0] (brightness adjusted) via Pixabay https://pixabay.com/photos/crescent-moon-lunar-918793/
molecule
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
mountain range/chain
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Kingscanyon l7 2002262 lrg" by Jesse Allen [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Kingscanyon_l7_2002262_lrg.jpg
"Mountains Snow Mountain range" by Itaya Lightbourne [CC0] (cropped) via Needpix https://www.needpix.com/photo/1433898/mountains-snow-mountainrange-pacificnorthwest-washington-washingtonstate-usa-nature-panoramic
neap tide
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
net force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
neutron
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
Newton (N)
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Ruler Measure Measurement" by UnboxScience [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/ruler-measure-measurement-tool-908891/
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/
niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Earthworms The Frog’s Perspective After the Rain" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixels.net/Earthworms-After-The-Rain-The-Frogs-Perspective-2773457
noble gas
"Smiley Face Average" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-average-okay-3189736/
nonmetal
"Sulfur-sample" by Ben Mills [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772
nucleus (atomic)
"Lithium Atom Isolated" by geralt [CC0] (orbital lines brightened) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
nutrients
"Medicine Pills Bottles" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/medicine-pills-bottles-medical-296966/
"Boy Human Male" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/boy-human-male-man-people-person-2025115/
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Vegetable Carrot Food" by dbreen [CC0] (no alterations) via Pixabay https://pixabay.com/photos/vegetables-carrot-food-healthy-1085063/
ocean tide
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Rocks Coastline Cornwall" by laroberts58 [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-coastline-cornwall-sea-wave-1317716/
"Rhine River Low Tide" by distel2610 [CC0] (cropped) via Pixabay https://pixabay.com/photos/rhine-river-low-tide-waters-3596913/
omnivore
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg
orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/
parasitism/parasite
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Bad" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/
particle
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
pattern
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
period (Periodic Table)
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
Periodic Table of the Elements
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)
phase
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-