How do erosion and deposition work together to form sand dunes?

Wind forms many sand dunes by deflation: it lifts and carries loose sand away, causing erosion. When the moving sand meets an obstruction, such as a rock or plant, the wind slows and deposits the sand there. Over time, the deposited sand builds into a dune, so the correct choice is “Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.”

AI-written and checked against the verified answer.