states of matter

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Across
  1. 1. physical substance
  2. 3. is a type of energy
  3. 5. the space in something
  4. 7. the melting point of water is 0DEG
  5. 9. when a solid turns into a solid
  6. 10. a type of matter that starts with L
  7. 13. when solid turns into a liquid
  8. 14. becomes bigger
  9. 16. is a species of atom
  10. 17. can be observed or measured
  11. 19. when a liquid turns into Gas
  12. 20. when liquid into a solid
  13. 21. wight of something
Down
  1. 2. small modules in motion
  2. 4. is evident during/ after a chemical reaction
  3. 6. a code
  4. 8. a type of matter that starts with G
  5. 11. when gas turn into a liquid
  6. 12. a movement of substance
  7. 15. the boiling point of water is 100DEG
  8. 18. a type of matter that starts with S