What was the effect of the flooding in the indus river valley?
a) the homes were washed away.
b) people fled to other lands.
c) the silt from the river made the land fertile.
d) the people were able to establish better trade routes.

i think the answer is  a or c

Explanation:

Experts think the fluctuations of the Indus had a major impact on Mohenjo Daro. It whipped back and forth across the plains, causing floods that destroyed the agricultural base of the city. Trade and the economy were disrupted. Hundred of villages may have been destroyed by floods or by rivers carving new channels.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

chemicals that are toxic to plants