GENERAL GEOLOGY

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: -Sand dunes are mounds of loose sand grains heaped by the wind. Regarded by some as little more than expansive sand boxes for recreation and exploitation, dunes are complex and beautiful structures formed over many years.

Detailed explanation-3: -Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.

Detailed explanation-4: -a hill of sand made by the wind on the coast or in a desert.

Detailed explanation-5: -Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have a shorter slip face in the lee side. The valley or trough between dunes is called a dune slack.