Cumulative project crossword puzzle

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Across
  1. 2. makes the ground black and rich with nutrients
  2. 5. a written record of the past
  3. 8. A large landmass that juts out from a continent
  4. 12. moved
  5. 14. mouth of a river
  6. 16. stories that can explain people's beliefs
  7. 18. the belief in many gods or goddesses
  8. 19. skilled craftsmen
Down
  1. 1. the time before writing was invented
  2. 3. professional writers
  3. 4. between the rivers
  4. 6. a strict system of classes
  5. 7. a fortress
  6. 9. the region south of egypt
  7. 10. people who travel place to place to find food.
  8. 11. protective walls from ancient China
  9. 13. A substitute ruler for for the ruler if he/she is unable to rule.
  10. 15. the belief in one god
  11. 17. modern humans and ancestors of modern humans
  12. 18. where pharaohs get buried when they die