Billions of years ago, how did Earth come to have an oxygen-rich atmosphere? A. Volcanic outgassing B. Comet impacts C. Algae activity D. Earth's cooling E PREVIOUS

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asked Jul 15, 2020 141k views

5 votes

Billions of years ago, how did Earth come to have an oxygen-rich

atmosphere?
A. Volcanic outgassing
B. Comet impacts
C. Algae activity
D. Earth's cooling
E PREVIOUS

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middle-school

Hamid Rouhani asked

by Hamid Rouhani

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1 Answer

7 votes

The answer is C.........

GlaIZier answered Jul 21, 2020

by GlaIZier

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