light and sound revision

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Across
  1. 3. light bends when it is...
  2. 5. block of wood is opaque
  3. 6. which travels more quickly
  4. 8. what type of waves are light
  5. 11. what type of reflection is seen in a mirror
  6. 12. a dark shaped caused when an object blocks light
  7. 14. objects that cannot make their own light
  8. 15. light travels in a ... line
Down
  1. 1. blocks light from passing through it
  2. 2. light bounces when it is ...
  3. 4. can travel through space
  4. 5. if an object allows all light to pass through it, it is said to be..
  5. 7. not easy to see through it
  6. 9. straight lines of light
  7. 10. I can travel through solids, liquids, and gases.
  8. 13. sound is produced by