Sound Waves Crossword

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Across
  1. 2. Waves with crests and troughs
  2. 3. Length between two waves
  3. 9. Area where particles are closest
  4. 10. Vibrations that travel through air
Down
  1. 1. Area where particles are farthest
  2. 4. Height of the crest and trough of a wave
  3. 5. "Slinky waves"
  4. 6. Amount of waves produced
  5. 7. Sound needs to travel through a _________
  6. 8. Unable for sound to travel through