Which is one theory about what caused the decline of the indus valley civilization answers: the soil became too salty for crops to grow earthquakes in the himalayas caused massive destruction merchants and traders stopped coming into the valley diseased animals created food shortages for the people

The correct answer is that the soil became too salty for crops to grow, which led to the decline of the Indus Valley civilization. The drought caused by this salinity generated a great decrease in the commercial capacity of this civilization against the Egyptians and Mesopotamians, who where de facto those who supported the consumption of the Indus civilization through the exchange of goods.

the roman empire began to fall

it is a : ) always outside of government control