Wind is best described as what is created when
a. water passes through various layers of air
b. warm, moist air rises from earth’s surface
c. air moves from high to low pressure areas
d. temperatures increase, causing humid conditions

Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
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