Mesopotamia Crossword-Do You Know Your Stuff?

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Across
  1. 2. An independent city
  2. 4. A system in which people are ranked one above the other
  3. 8. A geographical area of fertile land in the Middle East
  4. 10. Extreme lack of food
  5. 12. A river that surrounds Mesopotamia
Down
  1. 1. A rectangular religious stepped tower
  2. 3. A select group that is superior in terms of ability
  3. 5. The body of people ordained for religious duties
  4. 6. Ruler of the Akkadian Empire
  5. 7. "Between rivers"
  6. 9. Dry but having slightly more rain then an arid climate
  7. 11. A major change that causes lots of conflict/anger