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The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity. ... By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

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Earth's atmosphere consists of different types of gases like oxygen, nitrogen, carbon dioxide, etc in different proportions
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Earth atmosphere is 78% nitrogen,  21% oxygen, 0.9% argon and 0.03% carbon dioxide with some percentage of other elements.

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