How do human activities cause droughts and floods ?

Dear student, 
Please find below the solution to the asked query        

Human activities like cutting down of trees reduces the ability of soil to hold water. This leads to drying of ground and trigger droughts. Other activities like urban development, destruction of natural wetlands etc. lead to floods. Urban development cause water runoff to streams during heavy rains which leads to higher level of water in water bodies and more frequent episodes of floods.

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