Why is Earth's current atmosphere made up mostly of nitrogen and oxygen? A. Earth is eroding. B. Earth is warming up. C. Earth is continuing to cool. D. Earth has living things on the surface.

Why is Earth's current atmosphere made up mostly of nitrogen and oxygen?

A. Earth is eroding.
B. Earth is warming up.
C. Earth is continuing to cool.
D. Earth has living things on the surface.

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Why is Earth's current atmosphere made up mostly of nitrogen and oxygen? A. Earth is eroding. B. Earth is warming up. C. Earth is continuing to cool. D. Earth has living th…

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