Roxie's fun puzzle

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Across
  1. 2. Islamic church
  2. 4. difference between groups off of religion
  3. 8. Sumerian writing system
  4. 11. underground canals
  5. 12. oil petroleum exporting countries
  6. 13. person messenger of God
  7. 15. any grains
  8. 16. domestic Product value of goods
  9. 17. Mountains stretches from northwest Africa
  10. 18. streamed that is dry
  11. 20. largest peninsula in world
  12. 23. business that provides service
  13. 24. Persian language
  14. 25. the raising of livestock
  15. 28. triangular section of land
  16. 29. water is boiled
Down
  1. 1. Crescent cradle of civilization
  2. 3. temple of mud
  3. 5. chemical product
  4. 6. soil deposit rich soil made of sand
  5. 7. monotheistic religion
  6. 9. Mediterranean sea in western Asia
  7. 10. water in middle of desert
  8. 14. member of nomadic desert people
  9. 19. life and teaching if Jesus Christ
  10. 21. worships Allah
  11. 22. removal of salt from sea
  12. 26. underground water-bearing layers
  13. 27. related to earthquakes