What is true about the depth of the troposphere?
A. It varies with passing air masses.
B. It is shallower over the warm tropics.
C. It is deeper in winter.
D. It is shallower in summer.
E. It is deeper over the cooler poles.
A
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The mixing ratio is the most important of the moisture indices because:
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A. a diagram that illustrates flood recurrence intervals. B. a plot of stream stage or discharge versus time. C. a graph of variations in precipitation through time. D. a map showing the extent of a floodplain.