- Decline period: The decline of the Indus Valley Civilization is generally believed to have occurred between 1900 BCE and 1300 BCE.
- Multiple theories: There is no single theory for the decline of the Indus Valley Civilization; it is likely due to a combination of factors.
- Environmental factors: The most widely accepted theory is the climate change, which led to changes in the river system and arid conditions in the region.
- Rivers drying up: A shift in the course