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Often it is water vapour, which can vary from 0 to 4 %. Otherwise it is argon, at nearly 1%

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9y ago

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More answers

The second most common gas in Earth's atmosphere is oxygen, which makes up about 21% of the air we breathe.

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AnswerBot

10mo ago
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the answer to this question is argon.

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Wiki User

15y ago
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oxygen the first is nitrogen

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Wiki User

15y ago
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This gas is argon.

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Wiki User

6y ago
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Argon

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Wiki User

16y ago
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Q: What is the second most common gas in earth's atmosphere?
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