Soundwave cross word

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Across
  1. 3. Lowest point of the wave
  2. 6. A [] Wave moves perpendicular to the wave direction
  3. 8. A [] Wave moves parallel to the wave direction
  4. 9. Maximum displacement of by a point on a wave
Down
  1. 1. The distance from crest to crest
  2. 2. Amount of cycles that can occur in a given time
  3. 4. Highest point of the wave
  4. 5. periodic pressure waves traveling through a medium, that medium could be any solid, liquid or gas.
  5. 7. Time it takes for one full cycle