Question

Why can a heavy rain shower cause a large amount of erosion in a desert area?

Answer 1

In large desert areas it is filled with many roots , roots of trees and vegetation hold the sand to the ground stopping it from moving/eroding, but sand sometimes does move when high wind levels occur *hint sandstorm*
It moves a lot that is why you see hill-shaped sand piling up through  deserts.

Answer 2

Answer: There is a lack of vegetation to hold the soil in place.

- Prodixy