Year 7 extra time

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Across
  1. 3. The state change between solid and liquid
  2. 4. The process of separating ink into different colours
  3. 8. What sort of power station uses waterfalls?
  4. 11. The organelle that controls the cell
  5. 14. A _____ reaction is when a more reactive element takes the place of a less reactive element
  6. 17. When an acid reacts with an alkali
  7. 18. What element has the symbol "H"?
  8. 20. You can reduce air resistance by reducing surface___
  9. 21. These help with photosynthesis
  10. 22. What is the force that resists motion between two surfaces?
Down
  1. 1. Sand can be separated from water using ____ paper
  2. 2. Muscles work together in ____ pairs
  3. 5. The organ that moves blood around the body
  4. 6. These are where respiration takes place
  5. 7. Multiple elements bonded together
  6. 9. Speed = _____ / Time
  7. 10. What colour are Mr Isaac's nails?
  8. 12. What colour is Mr Isaac's hair meant to be?
  9. 13. Small air sacs inside the lungs
  10. 15. What energy store do moving objects have?
  11. 16. What is the unit of power?
  12. 19. The gas humans need for aerobic respiration