Which geographic characteristics were factors in the decline of Sumer
a. It was located far away from rivers.

B.
Flat land with poor drainage led to salinization from irrigation waters.

C.
It was located on the Persian Gulf.

D.
It was located on a flat plain that made it vulnerable to attack.

Question

Which geographic characteristics were factors in the decline of Sumer 
a. It was located far away from rivers.
 
 B.
Flat land with poor drainage led to salinization from irrigation waters.
 
 C.
It was located on the Persian Gulf.
 
 D.
It was located on a flat plain that made it vulnerable to attack.

joel_the_boss · Answer

A and B: The rain and rivers annually flooded sumer's irrigation ditches and too much time in the water made the soil bad because the water had salt in it and the  salt deposits ruin the soil... and  It was located on a flat plain that made it vulnerable to attack.