Why were so many cities able to develop between the Tigris and Euphrates rivers? (a)The cities were protected by mountains to the west.
(b)The forests provided plentiful lumber for construction.
(c)The cities were protected by a vast desert to the east.
(d)The rivers were used for irrigation, which led to a food surplus.

D

Explanation:

Ancient civilizations had been known to begin developing around rivers, since water was not as abundant. The rivers were commonly used for drinking and irrigation.

hola. and why do you hate your life: (? do you need someone to talk to? if so im here.: )

explanation:

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.