Sound Crossword

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Across
  1. 3. To change in shape
  2. 5. To move back and forth
  3. 7. The number of peaks and valleys in 1 second
  4. 10. Lowest level
  5. 11. Small portion of matter
  6. 15. Distance from the starting point a peak or valley
Down
  1. 1. A substance that lets waves travel through it
  2. 2. The transfer of energy from a vibrating object in waves that travel through matter
  3. 4. A substance that has mass and takes up space
  4. 6. An object that receives sound waves
  5. 8. When 2 things crash
  6. 9. The highness or lowness of a sound
  7. 12. to bounce back
  8. 13. Highest level
  9. 14. Vibrations that travel through the air