The change on earth takes place through its agents. So , general knowledge about the gradation change of earth is important.For example Wind is an active agent of gradation mainly in the desert where it blows unchecked due to lack of vegetation. The sand and dust particles are carried over greater distance. These get deposited when the wind velocity reduces or when there is an obstruction in the path of the wind.
Test Your Knowledge on Gradation of Change- Geography
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