Arctic

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Across
  1. 2. - Sculpture made of snow
  2. 4. - Slow-moving river of ice
  3. 6. - Unique crystal of frozen water
  4. 8. - Large floating mass of ice
  5. 9. - Ice house
  6. 10. - Large white bear
Down
  1. 1. - Marine mammal with tusks
  2. 3. - Marine mammal with flippers
  3. 5. - Small, white fox
  4. 7. - Natural light display in the sky