The concentration of carbon dioxide in the atmosphere is
A) approximately 75%.
B) approximately 50%.
C) a small fraction of 1%.
D) approximately 10%.
E) approximately 30%.
Correct Answer:
Verified
Q40: Air is best described as a(n)
A) chemical
Q41: Ozone is actually
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Q42: _is(are) crucial to the formation of clouds
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Q46: Water vapor is nearly absent_ .
A) in
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