The tropopause occurs at a ________ elevation above the tropics than above the poles because ________
A) higher; the stratosphere is thinner over the tropics and this allows the troposphere to expand
B) lower; the troposphere weighs more in the tropics and so it sinks
C) lower; the stratosphere is thicker over the tropics and so it compresses the troposphere
D) higher; the troposphere is hotter in the tropics, and this causes the air to rise to greater heights
D
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