Earth's Atmosphere quiz
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Why is the daytime sky blue?
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More questions about Earth's Atmosphere
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which gas makes up most of the air?
Answer: Nitrogen
Why: Nitrogen fills about 78% of dry air, nearly four times the share of oxygen.
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Which gas gives most auroras their green glow?
Answer: Oxygen
Why: Blue and purple tints in an aurora come from nitrogen instead.
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On average, how much does air cool per km up in the troposphere?
Answer: About 6.5 °C
Why: Using this rate, the standard atmosphere puts air 11 km up at -56.5 °C, against 15 °C at sea level.
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How long would driving straight up to space take at 100 km/h?
Answer: About an hour
Why: The usual edge of space is the 100 km Kármán line, though NASA and the US Air Force draw it lower, at about 80 km.
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Where do most meteors burn up?
Answer: Mesosphere
Why: At around -90 °C, the top of the mesosphere is the coldest part of Earth's whole atmosphere.
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How much does the air above a square metre at sea level weigh?
Answer: About 10 tonnes
Why: We are not crushed because air presses from every side at once and the pressure inside our bodies pushes back.
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