The rocky mountains

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Across
  1. 3. special rocks from a long time ago
  2. 4. when an island splits off of a continent
  3. 10. scratch marks on certain rocks
  4. 11. the mountains are made of them
  5. 13. the highest temperatures in the rockies
  6. 14. are there still indigenous people living there?
  7. 15. the rulers of the rocky mountains
  8. 16. the most visited glacier in north america
  9. 19. the rocky mountains are __ years old
  10. 20. how tall the rockies are
  11. 21. the continent that the rockies divide
Down
  1. 1. how long the rockies are
  2. 2. one of the main predators of the Rocky mountains
  3. 5. how many mountain ranges the rockies are
  4. 6. a species of animal that kills other animals
  5. 7. safe area for flying species
  6. 8. bubbling hot helium are found in these
  7. 9. the rockies are 3000 _____ long
  8. 11. when a mountain becomes a crater
  9. 12. the rockies are important to direct ______
  10. 17. main factor of an earthquake
  11. 18. a very big version of a volcano