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How have human activities caused desertification? Explain.                                                      (3)


Fertile top-soil can be removed very easily due to human activities like over cultivation and monoculture, unrestricted grazing, deforestation and poor irrigation practices, resulting in arid patches of land. When the large arid barren patches extend and meet over time, a desert is created. This is called desertification.                                                                                                (3)