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The decline of Harappan culture is difficult to explain. During its late phase between 2000 and 1700 BC 'The Indus Valley Civilization as a distinct entity gradually ceased to exist'. Historians have different opinions regarding the causes of the decay and disappearance of the Harappan culture. Various causes have been ascribed for its weakening and then decay: Increase in rainfall, earthquake, decrease in fertility of soil, floods, Aryan invasion, disease etc.

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Q: When did Harappa and mehenjo-Daro societies disappear?
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