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In Geography / High School | 2014-10-14

Which gas forms 21% of the Earth's atmosphere?

Asked by AlleenGali525

Answer (2)

**Oxygen **forms 21% of the Earth's atmosphere.

Answered by naǫ | 2024-06-24

Oxygen forms approximately 21% of the Earth's atmosphere and is essential for the respiration of living organisms. Nitrogen comprises about 78%, while argon makes up about 0.9%. The balance of gases in the atmosphere is crucial for maintaining life and ecological processes on Earth.
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Answered by naǫ | 2025-01-12

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