all units

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Across
  1. 4. Reason to go to a place.
  2. 7. People per unit of land.
  3. 8. Moving to a new place.
  4. 9. Idea spreads but changes.
  5. 13. The level of detail on a map.
  6. 14. Spread from important people or places.
  7. 15. Popular, widespread culture.
  8. 16. Shared culture and ancestry.
  9. 18. Growth of cities.
  10. 19. Traditions in small groups.
Down
  1. 1. Reason to leave a place.
  2. 2. Growing food or raising animals.
  3. 3. Spread by people moving.
  4. 5. Spread quickly like a virus.
  5. 6. How something spreads over space.
  6. 10. An area with common features.
  7. 11. Group of related languages.
  8. 12. A specific location on Earth.
  9. 17. How many people land can support.