Question

how do sand dunes move

Answer 1

Sand dunes are masses of loose sand that move across the ground in wind. The grains are blown up the windward side of a dune until they reach the top; then they drop down into the shelter of the lee (the side away from the wind). Other grains are blown up and over, burying the first.

Answer 2

Mostly because of the wind outside and inside the loose sand. It blows the windward and makes it get to the top. Just the wind though