The Composition of the Atmosphere
The Composition of the Atmosphere. Dry Atmosphere at Sea Level (% by Volume). Nitrogen 78.084 Oxygen 20.948 Argon 0.934 Carbon dioxide 0.033 (increasing yearly) Neon 0.00182 Hydrogen 0.0010 Helium0.0052 Methane 0.0002* Krypton 0.0001 Xenon 0.000008 Carbon monoxide, ozone, ammonia,
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