Living on the Ice

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Across
  1. 2. Common; basic requirements.
  2. 4. How useable something is.
  3. 8. A deep crack in a glacier (or land).
  4. 10. Vast; enormous.
Down
  1. 1. No other communities for many miles.
  2. 3. Clever and inventive.
  3. 5. The maximum and minimum angle of the sun each year.
  4. 6. Freely roaming people.
  5. 7. Countless; multiple.
  6. 9. Rapidly changing and unpredictable.