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symbo symbo
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7 years ago
The large amount of free oxygen in the Earth's present atmosphere is primarily a result of
A)   out-gassing by volcanoes and other geological processes.
B)   biological processes such as photosynthesis.
C)   splitting of carbon dioxide into carbon and oxygen by solar ultraviolet light.
D)   carbon dioxide becoming dissolved in the oceans, releasing oxygen.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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7 years ago
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symbo Author
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7 years ago
Smart ... Thanks!
gmiannotti
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Yesterday
Thanks
kh540941
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2 hours ago
Brilliant ツ
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