ICSE Class 6 Answered

The following theories have been put forth by historians as possible reasons for the decline of the Harappan civilisation:

1. There is a possibility that natural calamities such as earthquakes, floods or epidemics might have destroyed the Harappan sites.
2. Invasions by foreign tribes, like the Aryans, might have been the reason behind the collapse of the Harappan Civilisation.
3. A natural change in the course of the river Indus might have made the land infertile, hence causing a collapse of the Harappan economy and society.