There is NO EVIDENCE that WAR is why the Indus River Valley Civilization disappeared.

ANSWER

Many scholars believe that the collapse of the Indus valley civilization was caused by climate change...By 1800 BCE, the Indus valley civilization climate grew cooler and drier , and a tectonic event many have diverted to disrupted river systems

answer; gravity pulls glaciers down hill and as glaciers flow it pick up rocks and soil;

2,407.2 miles. or 32 hours.