Know Your National Parks

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Across
  1. 6. Still Growing
  2. 8. Colorado River
  3. 10. 3 States
  4. 13. 1.8 Billion-Year-Old Rocks
  5. 15. First East Of The Mississippi
  6. 17. Now Denali
  7. 18. Tallest Trees
  8. 19. Donated
  9. 20. Hetch Hetchy included
Down
  1. 1. First
  2. 2. Named Based On What Built It
  3. 3. Volcano
  4. 4. Hoodoos
  5. 5. Underground
  6. 7. Mile Long Tunnel
  7. 9. Deepest Lake In The US
  8. 11. Mount Of The Devil
  9. 12. Original State Park
  10. 14. Towers Over Seattle
  11. 16. Man-Made Structures