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Which gas makes up about 78% of Earth’s atmosphere by vol... | QuestionStock

Representative image for question: Which gas makes up about 78% of Earth’s atmosphere by volume?

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Which gas makes up about 78% of Earth’s atmosphere by volume?

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Which gas makes up about 78% of Earth’s atmosphere by volume?

Options:

Nitrogen
Oxygen
Argon
Carbon dioxide

Correct answer: Nitrogen

Explanation: Nitrogen (N2) composes roughly 78% of Earth's atmosphere by volume; oxygen is about 21% and argon about 0.93% by volume.

Created 2026-03-10T17:17:30.392Z. Updated 2026-03-10T17:17:30.392Z.