Answer:
The flourishing Indus Valley Civilisation declined around 1800-1700 BCE. Historians give different reasons for its decline. Although people still continued to live there, the culture slowly declined. Buildings were now made of inferior materials and the walls and floors were of a lower standard. The streets were not maintained and bigger buildings were broken down into smaller homes. The drainage system broke and the streets were no longer clean. Trading became non-existent. The decline may have been due to the following reasons: The climate changed and it became drier and warmer. There was severe shortage of, water to support the people. Some died while others moved to cooler places with more rainfall. Another theory says that excessive deforestation led to ecological changes. Floods drowned the villages and cities. Some historians believe that the land became less fertile because of over cultivation. There was less food for the growing population and this led to the gradual decay of the civilisation. It is also thought that Aryans entered from the north and killed the people in the main cities. Archaeologists have found skeletons with broken heads in Mohenjodaro. It is not certain as to what actually happened. Perhaps there was a combination of reasons that led to the decline of the civilisation.
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