Where do icicles come from?

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Across
  1. 2. A small drop of a liquid.
  2. 4. A small piece of snow that falls from the sky
  3. 5. Water vapour frozen into ice crystals
  4. 8. A gas that we breathe
  5. 9. Make or become liquefied
  6. 10. At a low temperature
  7. 12. The measured amount of heat in a place or in the body
Down
  1. 1. Spike of ice formed when water falling from an object freezes
  2. 3. A state of matter that flows freely.
  3. 6. Matter that can be liquid, solid or gas
  4. 7. (Of a liquid) having turned into ice as a result of extreme cold
  5. 11. Light from the sun.