what natural occurrence kept the indus balley supplied with plenty of water
Some natural resources in the Indus are resources like sand and rocks.
Cold vegetation
The occurrence of natural barriers, during the Harappan period would have been an annual inundation of the sites as the natural reservoir engulfing them grew with run-off from Himalayas.
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The Indus Valley Civilization was most completely destroyed by natural disasters such as climate change. Flooding of the Indus River and changes in the monsoon patterns are believed to have contributed to the decline of this ancient civilization.
A natural surrounding is the environment
The Nile river and Sahara desert was there natural environment.
Natural environment is extremely important to the survival of those who inhabit it. Animals survive better in their own natural environment.
The animals adopt to their natural environment, by their suitable body structure which is supported to their surrounding environment.
The Ganges And Indus River.
Indus River and floodplains of rich soil