What is a theory about why the early cities of Indus Valley were abanded?

Early cities of the Indus Valley emerged along the Indus River and its tributaries, where a network of canals and reservoirs supplied water for irrigation and drinking. However , researchers believe that changes in the course of the river and a decline in rainfall gradually left these cities with inadequate access to water.

As water became scarce, the people living in these cities faced drought, famine, and other challenges that made their settlements unsustainable. This scarcity led to the abandonment of several cities, including Mohenjo-daro and Harappa, which were once thriving urban centers.

Factors that may have contributed to the depletion of water resources:

-Shift in the course of the Indus River and its tributaries

-Declining precipitation in the region

-Deforestation and degradation of the environment due to over-exploitation of natural resources, leading to reduced water retention in the soil.

-Climate change and fluctuating weather patterns that disrupted the region's water supply

Although this theory is widely accepted, there might have been other factors involved in the abandonment of these cities.