The main effect of the biosphere on the chemistry of the earth's crust has been to
A) create a reducing atmosphere.
B) create an oxidizing atmosphere.
C) increase the relative humidity.
D) decrease the relative humidity.
E) increase the level of atmospheric carbon dioxide.
Correct Answer:
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A)by converting
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A)slag.
B)gangue.
C)ore.
D)halite.
E)ash.
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