Which of these geographic factors contributed to the decline of sumer?
it was located on the persian gulf.
the tigris and euphrates rivers flooded every year, leaving behind dark, fertile soil.
sumer was located on a flat plain that provided no natural barriers to invasion.
mountains made agriculture difficult.

the cultivated soil had poor drainage, grain fields of one city-state bordered those of another which caused territorial wars. irrigation of the crops led to salty soil.there was lack of natural barriers that could discourage attack

i would say c.

hope this xddd

a

explanation:

just took the test

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.