SOUND

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Across
  1. 5. to protect our ears from loud sound
  2. 6. sound travels fastest
  3. 7. units of sound
  4. 8. sound travel slowest
  5. 9. produce high pitch
  6. 11. sound cannot travel
Down
  1. 1. when an object vibrates
  2. 2. material that can reduce the loudness
  3. 3. loud or soft sound
  4. 4. high or low sound
  5. 10. produce low pitch