Gas, solids, liquids

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Across
  1. 4. Solid to a gas
  2. 5. Ice
  3. 6. Ice to water
  4. 8. Heat goes into solid
  5. 9. Water to ice
  6. 10. Carbon Dioxide
Down
  1. 1. Liquid turning into a gas
  2. 2. Heat leaves the liquid
  3. 3. Liquid to gas
  4. 7. Water