Science crossword

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Across
  1. 3. where a liquid changes to a solid
  2. 5. the amount of space that a substance or object occupies
  3. 7. explanation of some aspect of the natural world
  4. 8. it becomes lower as the pressure is reduced
  5. 11. Property of matter to resist changes of the state of motion
  6. 13. changes from gas to liquid
  7. 16. the temperature that a solid melts at
  8. 17. transition from ice to gas skipping the liquid stage
  9. 18. 1 of the 3 states of matter which is the hardest
  10. 19. 1 of the 3 states of matter which isn’t solid nor liquid
  11. 20. net movement of molecules or atoms
Down
  1. 1. a substance that has all the same number of protons
  2. 2. energy of a moving physical body
  3. 4. smallest indivisible unit of a chemical substance
  4. 6. 1 of the 3 states of matter which is runny
  5. 9. attribute of a physical system or body
  6. 10. becomes evident during or after chemical react
  7. 12. a Liquid that occurs from its surface
  8. 14. becoming liquified by heat
  9. 15. substance that has rest mass and volume