Answer:
a dune is a mound or ridge of sand or other loose sediment formed by the wind, especially on the sea coast or in a desert.Step-by-step explanation:
Encyclopedic entry. A dune is a mound of sand this is formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. 6 - 12+ Earth Science, Geography, Physical Geography.