Respuesta :

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. Sand dunes serve an important purpose by protecting inland areas from coastal water intrusion. They are able to absorb the impact and protect inland areas from high energy storms and act as a resilient barrier to the destructive forces of wind and waves.

Answer:

Sand dunes are formed over many years when beach grass and other plants trap windblown sand. As more and more sand becomes trapped, a dune expands to store more sand. Sand dunes serve as sand reserves for beaches and help protect inland areas from storm surges, floods, wind, and waves.

Explanation: