the rotation of earth results in wider distribution of rain over the
earth.
If
no frequent spin, there would be a steady flow of cool air from pole
to equator. The cool air would be near the surface; as it warmed, the
air would gradually rise and flow back toward the the pole, dropping
its water content as it again cooled. This would tend to produce constant
rain near the equator and deserts in the northern and southern parts
of the world. The rotation of the earth helps break up this north-south
cycle by introducing an east (or west) deflection.
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