U.S. and Canada

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Across
  1. 1. A largely treeless area that continues the ascent about 4,000 feet
  2. 6. line of highest points in the Rockies that makes the separation between rivers flowing eastward and westward
  3. 7. one major of the two mountain chains in the eastern United States and Canada
  4. 9. huge swampland that covers some 4,000 square miles
Down
  1. 2. the other mountain system of the U.S. and Canada
  2. 3. permanently frozen ground
  3. 4. winds that blow from west to east in the middle of the latitude
  4. 5. Canada's longest river
  5. 8. a northern part of the interior lowlands that is a rocky, flat region covering nearly two million square miles and circling Hudson Bay
  6. 10. a group of 5 freshwater lakes in central america.