The indus valley people planted crops in the fields after the monsoons, when the rivers overflowed and left behind fertile silt. this silt was very good for growing crops. in this way, the harappans could produce a large amount of crops and feed a large number of people. based on this information, how did the rivers and monsoons lead to the development of cities in the indus valley? the monsoons and the rivers produced favorable conditions for a argaculture b democaracy c making pots . these conditions allowed the harappans to .