Question
How did Harappan or Indus Valley civilisation decline?

Answer

We are sure about the causes of decline of this civilisation but scholars are sure of the following reasons:
  1. Probably the rivers dried up.
  2. There could be deforestation as fuel was required for baking bricks and for smelting copper ore.
  3. Grazing by large herds of cattle, sheep and goats may have destroyed the green belt.
  4. It could be frequent floods troubling people.
  5. Or it could be invasion of Aryans who must have posted then towards South India.

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