Erosion and Deposition: Action of Wind and Waves

In the previous articles, we have been discussing various exogenic geomorphic agents like water (running water and groundwater) and glaciers. We have seen the evolution of landforms due to these agents. In this post, we discuss in detail how the wind and the waves cause the evolution of various landforms on the earth surface.

Action of Winds:

• ➢ The wind is the main geomorphic agent in the hot deserts.
• ➢ Winds in hot deserts have greater speed which causes erosional and depositional activities in the desert.
• ➢ The landforms which are created by erosional and depositional activities of wind are called as Aeolian Landforms.
• ➢ This process is not unique to the Earth, and it has been observed and studied on other planets, including Mars.
• ➢ An erg (also known as sand sea / dune sea / sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. It is defined as a desert area that contains more than 125 square kilometres of aeolian or windblown sand and where sand covers more than 20% of the surface. Smaller areas are known as “dune fields”. The largest hot desert in the world, the Sahara, contains several ergs.

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