States of matter

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Across
  1. 2. indefinite shape and indefinite volume
  2. 3. heat exits the system
  3. 8. the energy of motion
  4. 10. from a solid to a liquid
  5. 11. from a solid to a gas
  6. 12. from a liquid to a solid
Down
  1. 1. from a gas to a liquid
  2. 3. heat enters the system
  3. 4. the average kinetic energy
  4. 5. indefinite shape but definite volume
  5. 6. definite shape and definite volume
  6. 7. the flow of thermal energy
  7. 9. from a liquid to a gas