Answer:
The main causes of drought : (a) Droughts are caused due to monsoon failure, scanty rainfall and excessive use of underground water. (b) Over-exploitation of water depletes the sources faster than rainfall could recharge groundwater, especially in areas which receive scanty rainfall. (c) Due to deforestation and global warming, climatic conditions are affected adversely. This also leads to scanty rainfall. (d) Due to pollution of water resources.
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