The Land Bridge Theory

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Across
  1. 3. studied at the University of New Hampshire
  2. 5. connected to North America by a land bridge
  3. 9. connected to Asia by a land bridge
  4. 12. connected two continents
  5. 15. migrated from Africa using a land bridge
  6. 16. maybe traveled by boat to North America
  7. 17. archaeological site in Chili
  8. 18. discovered a mastodon bone
Down
  1. 1. Spanish missionary
  2. 2. studied by David M Hopkins
  3. 4. Dutch explorer hired by Peter the Great
  4. 6. Russian Czar from
  5. 7. discovered by Captain James Cook
  6. 8. discovered the Bering Strait
  7. 10. used the land bridge to cross into North America
  8. 11. frozen in a layer of ash from a volcano
  9. 13. two islands between Russia and Alaska
  10. 14. discussed possibility of land bridge in 1800s