Question

yardang and sand dune define

Answer 1

Yardang-A yardang is a sharp irregular ridge of compact sand lying in the directions of the current wind in exports desert regions. Yardangs are formed by the wind erosions of adjacent material that is less resistant.

Sand dunes- A sand dune is the Mount, Hill or ridge of sand that lies behind the part of the beach affected by the tides. They are formed over many years when wind blown sand is trapped by beach gases or other stationary object... Without vegetation, wind and waves regularly change the form and location of dunes.