This sounds easy!

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Across
  1. 2. This type of energy travels in longitudinal waves
  2. 5. This type of wave is produced a backwards and forwards movement
  3. 8. This type of energy travels in transverse waves
  4. 9. This type of wave is produced by an up and down movement
Down
  1. 1. Areas of closely packed particles in a longitudinal wave
  2. 3. Caused by the amplitude of a sound wave
  3. 4. The distance between two consecutive crests on a wave
  4. 6. How high or low a sound wave is
  5. 7. The number of waves passing a point in one second
  6. 10. A wave is the movement of _______ from one location to another