Which process will create new sand in a desert

Wind-blown sand grains striking any solid object in their path can abrade the surface. Rocks are smoothed down, and the wind sorts sand into uniform deposits. The grains end up as level sheets of sand or are piled high in billowing sand dunes.

Explanation:

it takes hundreds of years to become stable.

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b. lithosphere, asthenosphere, mesosphere   is the answer most likely