Ancient civilization

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Across
  1. 4. shape
  2. 5. king
  3. 10. region
  4. 12. ancient civilization
  5. 16. shortage of water
  6. 17. belief
  7. 18. system of writing
  8. 20. weapon
  9. 26. monarch
  10. 27. unity
  11. 29. vast
  12. 30. era
  13. 31. weather
  14. 33. aid
  15. 36. river
  16. 37. gun
Down
  1. 1. river
  2. 2. study
  3. 3. river
  4. 6. soil
  5. 7. culture
  6. 8. ancient
  7. 9. rules
  8. 11. land
  9. 13. decline
  10. 14. benefit
  11. 15. vanish
  12. 19. contamination
  13. 21. extend
  14. 22. starvation
  15. 23. desease
  16. 24. commerce
  17. 25. ruler
  18. 28. atomic
  19. 32. tale
  20. 34. harmful
  21. 35. rule