Science vocab words

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Across
  1. 4. the bouncing back or change in a direction of a wave after it strikes a barrier
  2. 8. moves perpendicularly
  3. 10. moves parallel
  4. 11. can be seen by the human eye
  5. 12. definite relative to the direction of propagation
  6. 13. distance between crest and peak
Down
  1. 1. the bending of waves
  2. 2. number of waves passed in a amount of time
  3. 3. sprial arms
  4. 5. does not require a medium
  5. 6. The greatest distance in particles
  6. 7. the bending of a wave as it passes from one material to another
  7. 9. time to complete one cycle of a phenomenon