Earth
How do sand dunes move?
Because wind lifts and pushes grains up one side and down the other. Sand grains bounce along until they pile up. When the steep side collapses, the dune shifts a little, slowly creeping across the land.
Earth
Because wind lifts and pushes grains up one side and down the other. Sand grains bounce along until they pile up. When the steep side collapses, the dune shifts a little, slowly creeping across the land.