The Polar Crossword...

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Across
  1. 5. Black-white bird, can't fly and lives in Antarctica
  2. 6. Santa...
  3. 10. Anagram of allsnowf
  4. 12. Big block of ice
  5. 13. Ice. All around. Never ends.
  6. 14. Down it went in three hours
  7. 16. Anagram of ales
Down
  1. 1. Bookshelf + Ice = Answer
  2. 2. Cold. Real Cold.
  3. 3. The North's Sister
  4. 4. *shiver* Blue toes.
  5. 7. Spring, summer, autumn...
  6. 8. Big wintry storm.
  7. 9. Northern Lights, Southern Lights. Anagram of aoraur.
  8. 11. Can you believe people live here?
  9. 15. Cool, lovely, icy, muggy, arctic, tropical, extreme