Exogenic Processes

Exogenic Processes

The exogenic processes derive their energy from the atmosphere, determined by the ultimate energy from the sun and also the gradients created by tectonic factors.
 
exogenic processes
  • Gravitational force acts upon all earth materials having a sloping surface and tend to produce movement of matter in the downslope direction.
  • Force applied per unit area is called stress. Stress is produced in a solid by pushing or pulling. This induces deformation.
  • Forces acting along the faces of earth materials are shear stresses (separating forces). This results in angular displacement or slippage of rocks.
  • Besides the gravitational stress, earth materials become subjected to molecular stresses that may be caused by a number of factors, amongst which temperature changes, crystallization and melting are the most common.
  • Chemical processes normally lead to loosening of bonds between grains, dissolving of soluble minerals or cementing materials. Thus, the basic reason that leads to weathering, mass movements, erosion, and deposition is development of stresses in the body of the earth materials.UPSC Prelims 2024 dynamic test series
  • As there are different climatic regions on the earth’s surface, the exogenic geomorphic processes vary from region to region. Temperature and precipitation are the two important climatic elements that control various processes.
  • All the exogenic geomorphic processes are covered under a general term called denudation. The word ‘denude’ means to strip off or to uncover. Weathering, mass wasting/movements, erosion, and transportation are included in denudation.

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