Cerrar
irrigation
layer
Levee
Maintaining
material
silt
Sumer
Tigris River
Euphrates River
city-state
Mesopotamia
Difficulties living in mesopotamia
Four major problems
Problems in the Zagros Foothills:Before Problems
Zagros foothills:Problems
Solutions to food shortages
The region became known as_______
The sumerians defended them selves by....
