Why do mushroom rocks have broad top and narrow base?
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The sand carried by wind rarely rises more than three or four feet above ground while in the eighteen inches nearest to the ground, sand concentration is the highest. Thus the sand blast effect or abrasion will be greatest at or, near the ground level. Continued abrasive action undercuts the upstanding rocks at their bases to produce Rock pedestal or Mushroom rocks
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Explanation:
In deserts when the winds blow, it erodes the lower sections of therock more than the upper section. It takes the shape of amushroom which is narrow at the base and wider at the top.
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