Chapters 17&18 puzzle

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Across
  1. 4. one of the two main rivers of Mesopotamia
  2. 5. chemical used in fertilizer
  3. 6. urban necessities like streets and sewers
  4. 14. open markets
  5. 16. raising of livestock
  6. 20. wedge shaped writing
  7. 21. grain
  8. 23. name of peninsula where Saudi Arabia is
  9. 24. muslim house of worship
Down
  1. 1. religious messenger
  2. 2. name of peninsula connecting Africa to Asia
  3. 3. egyptian picture writing
  4. 7. fertile soil left over from river floods
  5. 8. one of the two main rivers of Mesopotamia
  6. 9. area where a culture begins and spreads
  7. 10. refusal to trade with a country
  8. 11. belief in right of a group to have its own country
  9. 12. dry riverbed
  10. 13. tame
  11. 15. step pyramids
  12. 17. belief in one god
  13. 18. area in desert where water seeps to the surface
  14. 19. desert nomads
  15. 22. main river of Africa