Three Cups of Tea

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Across
  1. 4. Himalayan animal used as a pack animal (3)
  2. 6. Warm synthetic fabric often worn in cold weather (6)
  3. 7. Central to the book "Three Cups of Tea" (3)
  4. 9. Hot green tea, made with salt, baking soda, goat's milk and sour yak butter(5,3)
  5. 11. The second-highest mountain on Earth (1-3)
  6. 12. Glide down snowy slopes on these (4)
  7. 13. European mountain range (4)
  8. 17. Author of "Three Cups of Tea" (4,9)
  9. 18. Solidified due to cold temperatures (6)
  10. 19. Severe snowstorm (8)
  11. 21. Cold injury affecting extremities (9)
  12. 22. Tied together for safety in mountaineering (5)
Down
  1. 1. Slow-moving river of ice (7)
  2. 2. Main encampment at the foot of a mountain; where big expeditions rest and plan (8)
  3. 3. Legendary Himalayan creature (4)
  4. 5. Mountain range in which K2 is located (5)
  5. 8. Height above sea level (8)
  6. 10. Rapid descent of snow slopes down a mountain (9)
  7. 14. Skilled mountaineer and guide in the Himalayas (6)
  8. 15. Frozen water, common in winter (3)
  9. 16. Home to eight of the world's 14 highest peaks (5)
  10. 20. Climbing tool used for cutting steps in ice (6)