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. Every dune has a windward side and a slipface.

Detailed explanation-2: -Aeolian Transport is the first process of coastal dune formation and involves the movement and weathering of sand particles behind and along the shoreline.

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: -The correct option is C dunes. When winds blow across deserts, sand piles up to form sand dunes. In beaches, the waves of water act like the wind to pile up the sand to form dunes.

Detailed explanation-5: -It defines five basic types of dunes: crescentic, linear, star, dome, and parabolic. The most common dune form on Earth and on Mars is the crescentic. Crescent-shaped mounds generally are wider than long.