human
What is the difference between a sand dune and a desert?
assistant
A sand dune is a type of landform that is formed by wind erosion. It is typically a mound or ridge of sand that is created by the wind blowing across a sandy surface. Deserts are large areas of dry land that receive very little precipitation, with an average annual rainfall of less than 250mm (10 inches). Sand dunes can be found in deserts, but they are not necessarily located within them.