America the geographical

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Across
  1. 1. Largest mammal in North America
  2. 4. California tree so big it has its own military rank
  3. 6. Forrest in Arizona that's "scared"
  4. 8. Unit of currency
  5. 11. 2200 mile hiking trail in eastern US
  6. 12. A very active mountain
  7. 13. Northernmost town in Alaska
  8. 15. National park location of Going-to-the-sun road
  9. 17. Home to Old Faithful
  10. 18. Great lake entirely in the US
  11. 19. "Mountain" range in South Dakota
  12. 20. National bird
Down
  1. 2. Largest freshwater lake
  2. 3. Oldest bridge -older than the US itself
  3. 5. Worlds largest office building
  4. 7. The First state park in the US
  5. 9. National park known for its waterfalls
  6. 10. Longest river in the US
  7. 14. Southernmost US city
  8. 16. Wetland in Florida