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 The surface of the earth is continuously undergoing changes. Running water, moving ice, wind and waves are the main agents of gradation which continuously wear down the land surface and carry the broken fragments which are deposited in the low lying areas.
The process of reduction of height of landform is called 'degradation'. The process of depositing the eroded material is called 'aggradation'. Aggradation and degradation are the two main ways which as continuously at work creating different landforms on the earth surface.

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