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148 free Nature trivia questions with answers — nature quiz, new questions added Oct 2026.
75 free nature trivia questions with answers. Are you a nature enthusiast? Put your environmental knowledge to the test with our comprehensive nature trivia quiz. From fascinating wildlife facts to ecosystem dynamics, discover how well you know the natural world around us. Challenge yourself and learn something new today!
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Q 01Which is the largest ocean on Earth by surface area and volume?
Pacific
The Pacific is bigger than all of Earth's land combined; Magellan named it the 'peaceful sea' in 1520 because its waters seemed so calm.
Q 02What is the biological process by which plants convert light energy into chemical energy?
Photosynthesis
Photosynthesis in ancient cyanobacteria is what filled Earth's air with the oxygen we breathe, in what geologists call the Great Oxidation Event.
Q 03Which lizard family has eyes that swivel independently and a tongue up to twice its body length?
Chameleon
A chameleon changes colour mostly to signal mood, rivals and mates, or to handle temperature, not mainly to hide.
Q 04What is the most abundant gas in Earth's atmosphere?
Nitrogen
Nitrogen makes up about 78% of air, yet the gas does almost nothing for living things until the nitrogen cycle fixes it into compounds they can use.
Q 05Which desert is considered the largest hot desert in the world?
Sahara Desert
The Sahara Desert is far more than sand dunes: much of it is rocky plateau and gravel plain, because the wind carries loose sand away.
Q 06What is the highest mountain in Africa?
Mount Kilimanjaro
Mount Kilimanjaro sits just south of the equator, yet its summit holds glaciers, which lost about 85% of their ice between 1912 and 2011.
Q 07Which spot in the Mariana Trench is the lowest known point on the seabed?
Challenger Deep
Challenger Deep is named after HMS Challenger, whose crew first sounded the trench's depths in 1875 during a round-the-world science voyage.
Q 08What is the largest living reptile?
Saltwater crocodile
The saltwater crocodile, the largest living reptile, is a strong ocean traveller, turning up far out at sea and on remote islands.
Q 09What is the scientific study of fungi called?
Mycology
Mycology studies organisms that look and grow like plants, yet fungi are genetically closer to animals than to plants.
Q 10Aspirin's natural forerunner, salicin, comes from the bark of which tree?
Willow
Willow bark has eased pain and fever since antiquity, yet Bayer named Aspirin after meadowsweet, Spiraea, another plant that yields the same acid.
Q 11What is the largest living species of fish?
Whale shark
The whale shark is the biggest fish in the sea, yet it filter-feeds on tiny prey and is docile enough to pose no real threat to people.
Q 12Which gas do plants take in from the air to make their food?
Carbon Dioxide
Carbon dioxide and water go in and oxygen comes out, but that oxygen comes from splitting the water, not the carbon dioxide.
Q 13California's San Andreas Fault, where two plates slide past each other, is which type of plate boundary?
Transform
Transform boundaries neither make nor destroy crust, and a 1906 rupture of the San Andreas set off the fires that devastated San Francisco.
Q 21Which rock type forms when molten magma or lava cools and solidifies, as granite and basalt do?
Igneous
Igneous rock that cools slowly underground grows large crystals, as in granite, while lava that cools fast at the surface stays fine-grained, like basalt.
Q 22Which kind of relationship between two species leaves both better off?
Mutualism
Mutualism benefits both partners: clownfish shelter unharmed among a sea anemone's stinging tentacles, and in return drive off fish that would eat the anemone.
Q 23What is the scientific study of plants called?
Botany
Botany grew up alongside medicine: Padua's university garden, founded in 1545 and still in place, was planted so students could tell real medicinal herbs from fakes.
Q 14Which biome has permafrost and low-growing vegetation like mosses and lichens?
Tundra
Tundra soil has long stored carbon in its permafrost, yet in 2024 NOAA reported that, counting wildfires, the Arctic tundra now gives off more carbon than it absorbs.
Q 15Which type of cloud is typically thin, wispy, and found at high altitudes?
Cirrus
Cirrus clouds are wispy streaks of ice crystals, and they are often the first sign of an approaching warm front, with rain on the way.
Q 16In which layer of Earth's atmosphere is most of the ozone layer found?
Stratosphere
The stratosphere gets warmer the higher you go, because ozone there absorbs the Sun's ultraviolet light and heats the air.
Q 17Which leaf structures release most of the water a plant loses through transpiration?
Stomata
Stomata let water out whenever they open to take in air, so cacti and many other desert plants open theirs mainly at night, when less water is lost.
Q 18To which phylum do starfish and sea urchins belong?
Echinodermata
Echinodermata include starfish, which feed by pushing their stomach out through their mouth to digest a clam inside its own shell.
Q 19Which mineral sits at 1, the very bottom of the Mohs hardness scale, soft enough to scratch with a fingernail?
Talc
Talc's sheets of atoms are held together only by weak bonds, so they slip past one another, which makes talc soft enough to crumble into talcum powder.
Q 20What mainly causes Earth's seasons?
Axial tilt
Axial tilt drives Earth's seasons, which is why they are reversed between hemispheres: when the north tilts toward the Sun, the south has winter.
Q 24Which burrowing Australian marsupial is famous for its cube-shaped droppings?
Wombat
Wombat droppings get their corners from stiffer and softer bands in the gut wall, and the flat sides may help them stay put where wombats leave them to mark territory.
Q 25What term describes organisms such as plants that make their own food from inorganic sources?
Autotrophs
Autotrophs don't all need sunlight: microbes at deep-sea vents make food from chemicals such as hydrogen sulfide, feeding tubeworms and shrimp in the dark.
Q 26Which Australian animal can mimic chainsaws and car engines?
Lyrebird
The Lyrebird mixes its own song with copied sounds, and males sing this medley while dancing on a mound with their tails thrown forward over their heads.
Q 27Which Siberian lake is the deepest lake on Earth?
Lake Baikal
Lake Baikal is so deep because it lies in a rift valley where Earth's crust is slowly pulling apart.
Q 28What is the hardest known natural mineral?
Diamond
Diamond is the hardest natural material, so industry uses diamonds as abrasives to cut and polish other stones, and even other diamonds.
Q 29Which layer of Earth's atmosphere is closest to the surface and where most weather occurs?
Troposphere
The troposphere's rising, churning air makes weather and turbulence, which is why airliners often cruise just above it, where the air is calmer.
Q 30Which carnivorous plant is native only to the wetlands of North and South Carolina?
Venus flytrap
The Venus flytrap has long been poached from the wild for the plant trade, and in 2014 North Carolina made that poaching a felony.