The difference between the atmosphere's "permanent" gasses and "variable" gasses is that:

A) permanent gasses exchange rapidly between the atmosphere and the biosphere.
B) variable gasses are so called because of their horizontal displacement.
C) permanent gasses exhibit a constant proportion from the earth's surface to higher reaches of the atmosphere.
D) variable gasses are dependent on storms for world-wide dispersion.


Answer: C

Environmental & Atmospheric Sciences

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