Tag: rivers, coasts and glaciation

Barchan dunes are also known as Barkhan. These are crescent-shaped sand dunes which are formed by the action of wind predominately from one direction. In India, Barchans are found in the desert regions of the Rajasthan.

Denudation is the long-term sum of processes that cause the wearing away of the Earth’s surface by moving water, ice, wind and waves, leading to a reduction in elevation and relief of landforms and landscapes. Endogenous processes such as volcanoes, earthquakes, and plate tectonics uplift and expose continental crust to the exogenous processes of weathering, erosion, and mass wasting.

• Denudation is the wearing away of the surface of the earth. It is a larger process which involves the following
  
• 1- Wethering ie breakdown of rocks and other material on earth's surface
• 2- Erosion - removal of materials on the earth's surface from there original place
• 3- Transportation - the movement of eroded material to long distances
• Hence all the options are correct.

• Denudation is the process of wearing away of earth's surface. 
• Wethering is the process of wearing away of rocks on the surface of the earth.
• Thus wethering is the subprocess of denudation. Larger process of wearing away of earth's surface refers to Denudation thus it is the right answer.
• Erosion refers to the removal and movement of the material present on the earth's surface which involves denudation, wethering and transportation, has is not a specific answer.

• Sea-waves continuously strike at the rocks. Cracks develop. Over time they become larger and wider. Thus, hollow like caves are formed on the rocks. They are called sea caves.
•  As these cavities become bigger and bigger only the roof of the caves remains, thus forming sea arches.
•  Further, erosion breaks the roof and only walls are left. These wall-like features are called stacks.
• The steep rocky coast rising almost vertically above seawater is called sea cliff.