because its an chemical weather
dunes in the deserts, the sphinx's nose falling off.
I believe sand dunes are mechanical.
D. deposition
weathering
chemical weathering
chemical weathering..
The wind is a part of weathering, and the wind blows the sand dunes' top layers of sand around every day.
dhrian
sand dunes
The Sahara Desert, N. Africa, is often given as an example of a huge area of shifting sand dunes. Though, actually, the dunes form only a small part. The main part consists of rocky 'hamada': high, largely barren, hard, rocky plateaus, with very little sand.
dunes
i dont know i aint gonna tell u