General revision science crossword

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Across
  1. 5. external part of a plant cell
  2. 6. gives the plant its green colour
  3. 10. the process of changing state from gas to liquid
  4. 12. a temperature where solids turn into liquids
  5. 14. their particles can slide on one another
  6. 15. the name of solid water
  7. 16. the gas produced when boiling water
  8. 17. it helps the plant cells to store liquids
  9. 18. fundamental units of the nervous system
Down
  1. 1. a temperature where liquids freeze
  2. 2. a temperature where liquids start turning into gases
  3. 3. can be found on the sun's surface
  4. 4. you use it to measure the temperature
  5. 7. controls what goes in and out of the cell
  6. 8. their particles are strongly held together
  7. 9. external threads on some cells that keep away bacteria
  8. 11. their particles have almost no bonds to hold them together
  9. 13. the brain of the cell