MA SST Indus Valley Civilization Decline

There are many reasons, some of them are:Influx of refugeesOver PopulationFlooding
What could be the causes behind the decline of the Indus Valley Civilization?
Yes you're right, the expansion of the neighbouring desert increased the salinity and decreased the fertility of the soil so production of crops decreased
I read in book that the expansion of the neighbouring desert is also one of the reasons behind its decline. Is it true?
The other reasons of the decline are:Invasion by AriansDrying of riversThe Indus Valley Civilization declined around 1750 BCE.
What are the other reasons for the decline?

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