7. How much of Earth's atmosphere is made up of nitrogen and oxygen?

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Earth atmosphere is primarily composed of nitrogen (78%) and oxygen (21%) with only small concentrations of other trace gases.

Expert answered|Score .9659|cloe7|Points 3563|

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Asked 7/16/2018 6:36:26 AM

Updated 282 days ago|3/8/2025 1:47:32 PM

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