Into Thin Air

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Across
  1. 2. any line formed by abutting edges
  2. 6. conforming to beliefs, attitudes or modes of conduct
  3. 7. wishing evil or harm to others
  4. 8. demanding or requiring vigorous exertion; laborious
  5. 11. to become used to something;to adjust or adapt
  6. 13. then or slender, weak
  7. 14. a large irregularity of glacial ice, as a pinnacle found in a glacial crevasse
  8. 17. any prop or support
  9. 18. not perfectly balanced or even
Down
  1. 1. a spiked iron plate worn on boots for aid in climbing or to prevent skipping on ice
  2. 3. a large mass of snow, ice detached from a mountain slope and sliding downward
  3. 4. foreboding; threatening
  4. 5. pertaining to or of a nature of phantasm; spectral
  5. 9. the entire stock of skills, techniques, or devices in a filed or job
  6. 10. something that is constantly changing
  7. 11. to fascinate or charm
  8. 12. like crystal clear or transparent
  9. 15. an upward movement; a rising movement
  10. 16. twilight or dusk