AP Environmental Sciencemediummcq1 pt
Which statement about Earth's atmosphere is correct?
A.It is mostly nitrogen and oxygen
B.It is mostly carbon dioxide
C.It is mostly oxygen
D.It contains no water vapor
Explanation
Core Concept
N₂ makes up ~78% and O₂ ~21% of dry air; greenhouse gases are trace but potent.
Correct Answer
AIt is mostly nitrogen and oxygen
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