Winter

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Across
  1. 4. – A dangerously low body temperature.
  2. 7. – Delicate ice crystals forming on cold surfaces.
  3. 8. – A massive, slow-moving river of ice.
  4. 9. – Relating to high mountains, often snowy.
  5. 11. – The shortest day or longest night of the year.
  6. 12. – A cold, treeless biome with frozen subsoil.
Down
  1. 1. – A structure that vents smoke from a fireplace.
  2. 2. – A state of inactivity and metabolic slowdown during winter.
  3. 3. – Ground that remains frozen year-round.
  4. 5. – Pertaining to or characteristic of winter.
  5. 6. – A natural display of lights in polar skies.
  6. 10. – A tree that stays green year-round.