| A | B |
|---|
| fertile | able to grow crops well |
| Mesopotamia | land between Tigris and Euphrates |
| Zagros | Mountains north of Mesopotamia |
| Sumer | place in Mesopotamia of first city-states |
| irrigation | a means of supplying land with water |
| levee | a wall of earth built to prevent a river from flooding its banks |
| silt | fine particles of rock |
| city-state | an early city that was like an independent country |
| moat | a trench filled with water, surrounding a city |
| Iraq | modern-day country where Sumer was located |
