because its an chemical weather
I believe sand dunes are mechanical.
D. deposition
An example of wind weathering is when sand particles carried by the wind collide with rocks, wearing them down over time through abrasion. This process can create interesting landforms like sand dunes or ventifacts.
chemical weathering
weathering
chemical weathering..
The wind is a part of weathering, and the wind blows the sand dunes' top layers of sand around every day.
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.
dhrian
sand dunes
Weathering can affect dunes by breaking down the sand particles into smaller grains, which can make them more susceptible to being blown away by wind. Weathering can also weaken the structure of dunes, making them more prone to erosion from waves and tides. Additionally, weathering can introduce new minerals into the sand composition, altering the dune's color and texture.
Scientificly, sand dunes were formed by chemical weathering.