Extreme environment

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Across
  1. 1. topic would you like the crossword to be about?
  2. 5. move around freely
  3. 6. or dangerous
  4. 9. enough; limited
  5. 10. with very little rain
  6. 11. away from cities or people
  7. 12. in size or area
  8. 14. Puzzle Vocabulary
  9. 18. above sea level
  10. 19. in an extreme way
Down
  1. 2. the meaning of altitude arid frigid harsh hostile humid remote scarce searing vast forage herd roam
  2. 3. rough, unkind, or unpleasantly intense
  3. 4. and wet in the air
  4. 7. and unpleasant
  5. 8. extremely cold in temperature
  6. 13. search widely for food
  7. 15. Bank
  8. 16. hot and burning
  9. 17. example: mystery, animals, school subjects, idioms, phrasal verbs, K-pop, etc. Also tell me the difficulty level if you want.