The statements that were factors in the decline of Sumer are:
Salinization of the soil occurred, and nomads invaded Sumerian city-states.
This is further explained below.
<h3>What is Summer?</h3>
Generally, Sumer is the name given to the civilization that flourished in the historical area of southern Mesopotamia throughout the Chalcolithic and early Bronze ages. Sumer is known as the "Cradle of Civilization."
In conclusion, the following are some of the assertions that contributed to the fall of Sumer:
There was a process of salinization of the soil. The Sumerian city-states were overrun by nomads.
Therefore, the second option and the last option are correct.
Read more on Sumer at:
brainly.com/question/13339074
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