Which gas makes up about 21% of Earth's atmosphere?

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Multiple Choice

Which gas makes up about 21% of Earth's atmosphere?

Explanation:
Air is made up mostly of two gases by volume: nitrogen and oxygen. Nitrogen accounts for about 78% of the atmosphere, while oxygen makes up about 21%. The remaining tiny amounts come from other gases such as argon, carbon dioxide, neon, helium, and others. So the gas that sits around 21% of Earth's atmosphere is oxygen. The rest of the air is largely nitrogen, which is why nitrogen dominates the composition overall.

Air is made up mostly of two gases by volume: nitrogen and oxygen. Nitrogen accounts for about 78% of the atmosphere, while oxygen makes up about 21%. The remaining tiny amounts come from other gases such as argon, carbon dioxide, neon, helium, and others. So the gas that sits around 21% of Earth's atmosphere is oxygen. The rest of the air is largely nitrogen, which is why nitrogen dominates the composition overall.

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