Atmosphere Trivia
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110 free Atmosphere trivia questions with answers — science & nature quiz, new questions added Oct 2026.
This atmosphere trivia quiz covers the science of the air above us, from the ground to the edge of space. It starts with the basics an eighth-grader should know (what air is mostly made of, which layer holds the weather, why the sky is blue) and works up to the details that trip up adults: which layer is the coldest place on Earth, why the thermosphere's 1,500 °C would not feel hot, and how much hydrogen the planet leaks into space every second. History and people get their share too. You will meet the French physicists who discovered the ozone layer in 1913, the Japanese meteorologist whose jet stream discovery went unnoticed because he published in Esperanto, the 1995 Nobel laureates who explained CFCs, and the treaty that became the first in UN history to be ratified by every country. A final stretch leaves Earth for the crushing carbon-dioxide air of Venus, the thin air of Mars and Titan's methane rain. Every answer was checked against Wikipedia's articles on the atmosphere, its layers and related topics, and each question quotes the sentence that supports it, so teachers, quiz hosts and curious readers can trust what they are asking.
30 of 110 questions with answers and explanations. Play the quiz
Q 01What force holds Earth's atmosphere to the planet instead of letting the air drift off into space?
Gravity
Gravity. The small, hot innermost planet has too weak a pull to do the same job, which is why it is left almost airless.
Q 02Oxygen, dry air's second most abundant gas, is about what percentage?
21%
21%. Almost all of it is a by-product of photosynthesis: before living things began releasing oxygen, the air held practically none.
Q 03After the two dominant gases, which gas ranks third in dry air at nearly 1%?
Argon
Argon. Almost all of it was made inside the Earth, by the slow radioactive decay of potassium in rocks, and has been leaking out into the air ever since.
Q 04CO2 makes up roughly what percentage of dry air by volume?
0.04%
0.04%. Small as that share is, burning fossil fuels had by 2024 pushed it about 50% above its level before the Industrial Revolution.
Q 05At what altitude is the Kármán line, the conventional edge of space?
100 km
100 km. The round number is a convention: Theodore von Kármán's own sums put the limit of winged flight nearer 84 km, and the US Air Force counts space as starting at 80 km.
Q 06In July 2021, whose spaceflight crossed the Kármán line days after a rival's flight had stopped short of it?
Jeff Bezos
Jeff Bezos. His New Shepard capsule cleared the line nine days after Richard Branson's rocket plane peaked below it, though still high enough to count as space by the US definition.
Q 07Which is the lowest layer of the atmosphere, where nearly all weather happens?
Troposphere
Troposphere. It holds most of the atmosphere's mass, and its air cools with height, which is why high mountain peaks can stay snow-capped in summer.
Q 08The ozone layer sits within which layer of the atmosphere?
Stratosphere
Stratosphere. Its air warms with height instead of cooling, so it barely churns, and airliners cruise along its calm lower edge to avoid the turbulence below.
Q 09Which layer of the atmosphere is the coldest place on Earth and where most meteors burn up?
Mesosphere
Mesosphere. It is too high for planes and balloons and too low for satellites, so it can only be sampled by brief rocket flights and remains the least understood layer.
Q 10The International Space Station orbits within which layer of the atmosphere?
Thermosphere
Thermosphere. Even 400 km up, enough thin air remains to drag on the station, so it slowly sinks and has to fire rocket engines every so often to climb back.
Q 11Which layer of Earth's atmosphere has no clear top and fades into space?
Exosphere
Exosphere. Its gas is so thin that atoms almost never collide and the fastest simply fly off, which is why some scientists count it as outer space, not atmosphere.
Q 12The troposphere, where air constantly rises and sinks, takes its name from the Greek tropos, meaning what?
Turn
Turn. The same Greek root gave us the tropics, the two lines on the globe where the Sun seems to turn back at the solstices.
Q 13Temperature rises with height in the ozone layer because ozone absorbs what?
Ultraviolet radiation
Ultraviolet radiation. The energy ozone soaks up warms the surrounding air, and it is also why most of the Sun's most harmful rays never reach the ground.
Q 21Which Philippine volcano's 1991 eruption threw up enough sulfur haze to cool the whole Earth?
Mount Pinatubo
Mount Pinatubo. Its blast lofted millions of tonnes of sulfur dioxide, and the thin haze that spread round the globe dimmed sunlight enough to cool the surface for about two years.
Q 22In 1985, British scientists reported that springtime ozone had thinned drastically above which continent?
Antarctica
Antarctica. Its winter is cold enough to form rare clouds high in the ozone layer, and their surfaces speed up the reactions that destroy ozone once sunlight returns in spring.
Q 23What did Paul Crutzen, Mario Molina and Sherwood Rowland jointly receive in 1995 for their work on ozone?
Q 14What phenomenon makes the daytime sky look blue?
Rayleigh scattering
Rayleigh scattering. Air scatters short blue wavelengths far more than long red ones, so at sunset, when light crosses much more air, the blue is stripped out and red is left.
Q 15Which gas does the most to trap heat in Earth's natural greenhouse effect, about half the total?
Water vapor
Water vapor. Together with the other heat-trapping gases it keeps Earth's surface near 15 °C; without them the average would be a frozen −18 °C.
Q 16Who became the first skydiver to fall faster than sound, jumping from a balloon 39 km up in 2012?
Felix Baumgartner
Felix Baumgartner. His voice link to the ground was Joe Kittinger, the retired US Air Force colonel whose own record jump of 1960 he had come to beat.
Q 17Ozone takes its name from the Greek for 'to smell'; which kind of weather fills the air with its sharp scent?
Thunderstorms
Thunderstorms. Lightning splits molecules in the air and some of the fragments end up as ozone; the chemist who named the gas knew its smell from lightning strikes.
Q 18Ozone shields life from high above, but near the ground it is a main ingredient of which urban air pollution?
Smog
Smog. Ground-level ozone forms when sunlight cooks traffic and factory fumes on hot days, and breathing it irritates the lungs that the same gas protects from above.
Q 19Which US president signed the treaty that phased out ozone-destroying chemicals, calling it 'a monumental achievement'?
Ronald Reagan
Ronald Reagan. He signed in April 1988, three weeks after the Senate had approved the deal without a single vote against it.
Q 20Which treaty to protect the ozone layer became the first in UN history ratified by every country?
The Montreal Protocol
The Montreal Protocol. It is working, too: a 2023 UN-backed assessment found the ozone layer on track to recover to its 1980 state within about four decades.
Nobel Prize in Chemistry
Nobel Prize in Chemistry. Molina and Rowland had warned in 1974 that everyday industrial gases could eat away the ozone layer, eleven years before a hole in it was actually found.
Q 24Which manufactured chemicals were the main cause of ozone depletion?
Chlorofluorocarbons
Chlorofluorocarbons. Invented as safe, non-toxic coolants for refrigerators, they drift up intact and release chlorine, and one atom of it can destroy many thousands of ozone molecules.
Q 25Oxygen atoms high in the atmosphere give the aurora its most common colour, which is what?
Green
Green. The same atoms glow red higher up, where the air is thinner, but that light is fainter and tends to show only when the Sun is unusually active.
Q 26The word 'aurora' comes from the Roman goddess of what?
The dawn
The dawn. The full name 'aurora borealis' means 'northern dawn', and it is said to date from a spectacular display that was seen right across France in 1621.
Q 27Besides Pierre Gassendi, which scientist is credited with first using the term 'aurora borealis' in the early 1600s?
Galileo Galilei
Galileo Galilei. The phrase appears in a 1619 discourse on comets that was largely his work, thirty years before Gassendi printed it, yet many reference books credit the Frenchman alone.
Q 28Noctilucent clouds, the highest clouds in the atmosphere, are made of what?
Water ice crystals
Water ice crystals. So little moisture reaches that height that the ice is thought to need something to freeze onto, most likely specks of smoke left by burnt-up meteors.
Q 29Noctilucent clouds were first recorded in 1885, two years after the eruption of which volcano?
Krakatoa
Krakatoa. Its ash painted sunsets so vividly that evening sky-watching became a craze, and whether the eruption made the clouds or simply put more eyes on the sky is still unclear.
Q 30What does 'noctilucent' roughly mean in Latin?
Night shining
Night shining. The clouds float so high that the Sun, already below the horizon for anyone on the ground, still lights them up against a sky that has gone dark.