Which gas is the most abundant in the atmosphere?

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Multiple Choice

Which gas is the most abundant in the atmosphere?

Explanation:
Nitrogen is the most abundant gas in Earth's atmosphere. It makes up about 78% of the air by volume, with oxygen around 21%, and the remaining 1% a mix of other gases. Its chemical stability means N2 doesn’t react away quickly, so once it accumulates in the atmosphere it remains the dominant component. In contrast, argon and carbon dioxide are present only in trace amounts, and oxygen, while abundant, is not as plentiful as nitrogen.

Nitrogen is the most abundant gas in Earth's atmosphere. It makes up about 78% of the air by volume, with oxygen around 21%, and the remaining 1% a mix of other gases. Its chemical stability means N2 doesn’t react away quickly, so once it accumulates in the atmosphere it remains the dominant component. In contrast, argon and carbon dioxide are present only in trace amounts, and oxygen, while abundant, is not as plentiful as nitrogen.

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