Frozen Wonders

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Across
  1. 3. Frozen spikes hanging from eaves.
  2. 8. Natural tunnel of frozen water.
  3. 10. Structure of frozen water molecules.
  4. 11. Surface perfect for skating.
  5. 12. Dancing lights in polar skies.
  6. 14. Heavy snowfall with strong winds.
  7. 15. Skin damage from extreme cold.
Down
  1. 1. Mix of rain and snow.
  2. 2. Pile of snow shaped by the wind.
  3. 4. Floating mass of ice in the ocean.
  4. 5. Slowly moving mass of ice and snow.
  5. 6. Ground frozen year-round.
  6. 7. Frozen pellets falling from the sky.
  7. 9. Gentle accumulation of flakes.
  8. 13. Fine ice crystals formed on cold mornings.