Mark each statement if it was a factor in the decline of sumer.

a.) nomads invaded sumerian city-states.
b.) salinization of the soil occurred.
c.) the cultivated soil had poor drainage.

All three statements were correct. Salinization was extremely high so the crops couldn't grow so people were starving often. The nomads did invade and sacked their cities on numerous occassions which weakened them. The poor drainage was also a problem and floods would ruin what croups they did manage to grow. In the end, they were conquered by Sargon.

Every statement this is because of the same law