Waves!

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Across
  1. 3. High points in transverse wave
  2. 4. the amount of waves that has passed in a certain amount of time
  3. 8. Low-density areas in longitudinal waves
  4. 9. Distance from rest position to crest/trough
  5. 10. High-density areas in longitudinal waves
Down
  1. 1. Distance from one crest to the next
  2. 2. Perpendicular to direction of vibrations
  3. 5. Parallel to direction of vibrations
  4. 6. Low points in transverse wave
  5. 7. A disturbance that transfers energy