Easy science

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Across
  1. 5. Point of liquid to gas.
  2. 6. What is water?
  3. 8. How hot or cold something is.
  4. 9. What is a chair?
  5. 10. What is lightning?
  6. 13. Gas to liquid.
  7. 14. What is air?
  8. 15. Liquid to gas.
Down
  1. 1. Point of solid to liquid.
  2. 2. Point of liquid to solid
  3. 3. A theory of molecules' kinetic energy
  4. 4. Solid to liquid.
  5. 7. Point of Gas to liquid.
  6. 11. Liquid to solid.
  7. 12. Makes up everything