valerieroyal valerieroyal

30-04-2018
Chemistry

contestada

What two gases make up 99% of the earths atmosphere

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Аноним Аноним

30-04-2018

Oxygen and nitrogen made up 99% of the Earth's atmosphere.

Oxygen - 21%
Nitrogen - 78%

Hope this helps. - M

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shaheims30 shaheims30

30-04-2018

Oxygen and nitrogen makes up 99% of Earth's atmosphere.

Hope this helps!! : )

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