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The mixture of gas that surrounds the Earth, that is Earth's atmosphere, is called "air".

By volume, dry air comprises 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

However, air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.

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Q: What is the mixture of gas that surrounds earth?
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