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