Wave of sound

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Across
  1. 4. The type of wave that ripples in water
  2. 7. The place of a sound wave where the particles are spread apart
  3. 9. What type of matter does sound travel through the worst
  4. 10. What type of matter does sound travel through the best
Down
  1. 1. The place where the particles of a sound wave are the closest together
  2. 2. The distance between two troughs or crests
  3. 3. The group of particles sound waves travel through
  4. 5. The type of wave sound is
  5. 6. The part of a transverse wave that is under the line of rest
  6. 8. The part of a transverse wave that is above the line of rest