Y8 Science crossword :]

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Across
  1. 3. connecting lines in a temperature map
  2. 5. light energy travels in_____
  3. 7. has a negative charge
  4. 8. can radiate through empty space
  5. 10. movement of air from area of high temperature and low temperature
  6. 13. outer layer of the earth
  7. 15. a push or pull
  8. 17. two or more atoms that are bonded
  9. 19. has a positive charge
  10. 20. temperature decreases, breaks bonds
  11. 21. collection of space debris, result of a star's death
  12. 22. visualizes forces acting on an object
  13. 24. mechanical waves need this to move
Down
  1. 1. measurement from one crest to another
  2. 2. particles travel in direction of wave velocity
  3. 4. any area affected by force
  4. 6. charge is measured in________
  5. 9. 7th element of the periodic table
  6. 10. clouds dont stop collecting___________
  7. 11. generally called kinetic energy
  8. 12. an echo is a _________ sound wave
  9. 14. has neutral charge
  10. 15. when warm/cold air moves to an area of different temperature
  11. 16. circuit
  12. 18. temprature increases, makes bonds
  13. 23. 10th element of the periodic table