North America Physical Geography

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Across
  1. 1. vast grassland of central north america that is largely treeless
  2. 4. a group of five freshwater lakes of central north america between the united states and canada
  3. 6. winds that blow from west to east
  4. 10. a person with no permanent home who moves from place to place according to season in search for food
  5. 11. a major mountain system of the united states and canada, extending 3,000 miles from alaska to new mexico
  6. 13. permanently frozen ground
  7. 14. the line of the highest points in north america that marks the separation between rivers flowing east and west
Down
  1. 2. one of two major mountain chains in the eastern united states and canada
  2. 3. canada's longest river
  3. 5. a land bridge thought to have connected what are now alaska and siberia
  4. 7. america''s most important deepwater ship route, completed in the 1950 as a joint project of the united states and canada
  5. 8. a section of a waterway with closed gates where water levels are raised or lowered
  6. 9. a northern part of the interior lowlands that is a rocky, flat region covering nearly 2 million sq miles
  7. 12. a large subtropical swampland in florida of about 4,000 sq miles