| A | B |
|---|
| Mesopotamia | in ancient times, the geographic area located between the |
| Sumer | an area in the southern part of Mesopotamia, where cities first |
| City-states | an early city that was like a small, independent country with its |
| Irrigation System | a means of supplying land with water |
| Plains | a flat piece of land |
| Reeds | weeds that grow near rivers |
| Zagros Mountains | mountains located in the northern part of Mesopotamia |
| Sumerians | ancient people who lived in the geographic area of Sumer |
| Levees | a wall of earth built to prevent a river from flooding its banks |
| Silt | fine particles of rock |
| Reservoir | a place where water is stored for later use |
