Question

decline of Harappan Civilization and Mesopotamian Civilization​

Answer 1

The destruction of harappan civilization caused due to change of course of the river Ghaggar.In his ancient india mentioned that the climatic, economic and political civilization and argued that the decline was actually due to a large-scale destruction.....

Aryan invasion was believed to be the major reason for the decline of harappan civilisation.

In mesopotamia, irrigation was essential for crop production. The rivers were higher than the surrounding plain because of built up silt in the river beds, so water for irrigation flowed into the fields by gravity..... Over time, the soil became toxic and would no longer support crops.