Where can Sand dunes form?

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.

Explanation:

answer; i believe that the correct answer is; ///bodies of water store heat during the day and release it at night;

a time line cause it goes from 685 to 978