The Land Bridge Theory

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Across
  1. 1. this increased when agriculture was discovered
  2. 4. crossed the land bridge with humans
  3. 5. what we call people who came to the Americas across the land bridge
  4. 9. as far south as the glaciers spread
  5. 11. the land bridge was between this place and Alaska
  6. 12. humans crossed over the land bridge between 30,000 and 15,000 ______ ago
Down
  1. 2. type of people who moved around, never staying in one place permanently
  2. 3. huge sheets of ice
  3. 6. practice of farming
  4. 7. these dropped during the Ice Age, which allowed rivers to carve valleys and create lakes
  5. 8. long period of time when temperatures dropped and a large portion of the Earth froze
  6. 10. this many thousands of years ago, the glaciers melted and flooded the land bridge