Decline of Indus Valley Civilisation

Dear everyone

What happened c. 1500 BCE? Lets ask that question to ourselves first before asking others. That, you need not worry as I have the answer to your solution.
The Indus Civilization was at its peak for about 500 years. They lived in the same kind of houses, used the same tools and ate the same food. The city (Mohenjo-daro) was destroyed for a number of times and it was built again and again. The exact causes for the destruction of this great civilization are not known. The cities might have been destroyed by natural disasters like earthquakes, floods or a change in the course of the Indus. The cities declined owing to Aryan invasions also. Deforestation was another cause for the destruction of this civilization. It was difficult during that time to bulid houses. They need to bulid houses repeatedly again and again, due to the natural disasters.

I will classify it as a primary source. The reason is because there are artifacts found in the civilisation.

Regards
Firdaus