THE BESTEST WAVE CROSSWORD OF EVER

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Across
  1. 2. This is one way a longitudinal wave moves
  2. 4. The top of a transverse wave
  3. 7. This kind of wave can move through a vacuum
  4. 9. This kind of wave moves up and down
  5. 10. This kind of wave needs matter to form
Down
  1. 1. This kind of wave moves up and down
  2. 3. What is this crossword about?
  3. 5. The bottom of a transverse wave
  4. 6. This is the other way a longitudinal wave moves
  5. 8. This is the distance from the crest to the starting point