INDIAN GEOGRAPHY

Detailed explanation-1: -A dune is a mound of sand 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. Dunes grow as grains of sand accumulate.

Detailed explanation-2: -One type of sand dune is called a barchan. A barchan sand dune is a crescent-shaped dune, with tips that point in the downwind direction, and has a steep slip face. Individual barchan dunes are separate from each other and gradually move along the barren desert surface.

Detailed explanation-3: -A large dune complex is called a dune field, while broad, flat regions covered with wind-swept sand or dunes with little or no vegetation are called ergs or sand seas.

Detailed explanation-4: -A sand dune is a hill or ridge beyond the reach of the tides, formed from sand over many years. They are ever-changing structures. Dunes usually form in bands parallel to the beach, getting taller and more chaotic the further away you get.