WORLD HISTORY

Detailed explanation-1: -There are many causes for the decline of Harappan civilisation. There were regular floods in the Indus and its tributaries. The overuse of wood for burning bricks that destroyed the forests, which made them migrate. The Aryans, who came from the north, could have attacked them.

Detailed explanation-2: -The Indus Valley civilization is called the Harappan civilization because Harappa was the first site where the unique archaeological evidences of the civilization were discovered.

Detailed explanation-3: -Archaeological sources of the Harappan Civilization include abandoned Harappan sites and their buildings, artifacts such as seals with inscriptions that were used to stamp clay with Harappan script and pictograms, and statuary.