Which may have been a reason for the decline of civilization in the indus valley? a. disease destroyed much of the population. b. major sandstorms destroyed the crops. c. craftsmen and laborers could no longer make a living.

The Indus Valley Civilization may have met its demise due to invasion. According to one theory by British archaeologist Mortimer Wheeler, a nomadic, Indo-European tribe, called the Aryans, suddenly overwhelmed and conquered the Indus River Valley.

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