Why do the poles receive less solar radiation than the equator?

It is because the North and South Poles don't point right at the Sun, as the Equator does, being on the top of the Earth the poles cannot get the direct rays from the Sun. But, the Equator can because it is always pointing towards the Sun, thus, getting more solar energy.
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Aeolian processes,  pertain to  wind  activity in the study of  geology  and  weather  and specifically to the wind's ability to shape the surface of the  earth  (or other  planets). winds may  erode, transport, and deposit materials and are effective agents in regions with sparse  vegetation, a lack of soil moisture and a large supply of unconsolidated  sediments. although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as  deserts