U.S and Canada crossword

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Across
  1. 9. a network of safe houses in the United States that helped thousands of slaves escape to freedom
  2. 11. ridge or high point that determines the direction of flowing water
  3. 12. changing the position,direction or place of something.
  4. 13. moving from one country to another and becoming a legal citizen
  5. 14. competition usually associated with violence
  6. 15. a boundary in the eastern United States where the higher land of the Piedmont drops to the lower Atlantic Coastal Plain
Down
  1. 1. the source of a river
  2. 2. changing something partially
  3. 3. a mild climate region in the southern and southwestern portions of the United States
  4. 4. a large population concentration made from several cities combined
  5. 5. a concentrated region of manufacturing industries in the northeastern and midwestern United States
  6. 6. a very large water tornado, another word for cyclone and typhoon
  7. 7. fuel made from prehistoric animal remains
  8. 8. a farming method in dry areas where the farmer relies on natural precipitation
  9. 10. small river that connects to a bigger river