Across
- 5. an area in southern Mesopotamia where cities first appeared
- 6. an early city that was like a small, independent country with its own laws and government
- 7. River a major river in western Asia
- 9. an artificial barrier that holds back water, forming a reservoir or controlling water flow
- 11. in ancient times, the geographic area located between the Tigris and Euphrates rivers
- 12. an artificial waterway constructed to allow the passage of boats or for irrigation.
Down
- 1. River a major river in western Asia
- 2. a strong disagreement
- 3. to keep in good condition or preserve
- 4. fine particles of soil or sediment that can improve soil fertility and water retention.
- 8. the method of supplying water to crops and land with water
- 10. a structure built to prevent flooding by controlling water flow from rivers or other bodies of water.