Question

how harappan civilisation diclined

Answer 1

the roads were damaged.
the kingship was heridetary.

Answer 2

The decline of the Harrapan civilisation is still unknown. Many acheologists believe that the decline of the Indus valley civilisation was due to the following reasons:
- River Indus is known for its disastrous floods, it is possible that it's people might have suffered because of it.
-Some acheologists believe that drought was the reason of decline. The river must have dried up and increasing tempurature forced the residents to migrate
-There were many wars and conflicts. People believe that kings must've forced the Harrapans to refuge elsewhere.
These are some reasonable ideas that might have encouraged the decline of the Harrapan civilisation