Laura’s crossword puzzle

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Across
  1. 5. interaction
  2. 6. rises
  3. 8. empire
  4. 11. of the world
  5. 13. of the mountains and the sea
  6. 14. early civilizations
  7. 15. classical culture
  8. 17. Empire falls
  9. 18. human origins
  10. 19. Age of west Africa
Down
  1. 1. Great Wall
  2. 2. system of a city
  3. 3. Games
  4. 4. Russians, and Turks interact
  5. 6. of the early river valley
  6. 7. rises
  7. 9. and peasant woman’s daily life
  8. 10. exchange and global trade
  9. 12. build a vast empire
  10. 16. of the Nile