Birthday Adventure

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Across
  1. 2. The arrangement of physical features of an area
  2. 3. One who hikes carrying their gear in a rucksack
  3. 4. South American mountain range popular amongst hikers
  4. 7. Last name of "The Father of National Parks"
  5. 10. Variety of life in a particular habitat or ecosystem
  6. 11. Author who penned "Walden," a reflection upon simple living in natural surroundings
  7. 13. Famous duo known for their early American exploration
  8. 14. America's first national park
  9. 17. Californian National Park known for its giant sequoias
  10. 18. A game of hide-and-seek with GPS coordinates in the great outdoors
  11. 19. Essential for hikers, usually achieved through a water bottle or bladder
Down
  1. 1. High-energy snack for hikers, also known as trail mix
  2. 2. Pioneer in hiking and exploration
  3. 5. Often used for warmth and cooking during overnight outdoor adventures
  4. 6. The act of preserving and protecting nature
  5. 8. The study of birds, loved by many nature enthusiasts
  6. 9. Flora and fauna in their natural habitat
  7. 12. Dense, tropical woodland known for its heavy precipitation
  8. 15. Highest peak in the world
  9. 16. The study of interactions among organisms and their environment