crossword puzzle

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Across
  1. 3. transfer of energy by a wave to the medium through which it travels
  2. 9. change of pitch when a sound source is moving in relation to an observer
  3. 10. distance that transfers energy from one space to another without transferring matter
  4. 11. amount of sound energy that passes through a square meter of space in one second
  5. 14. a wave that can only travel through matter
  6. 15. study of how sound interacts with structures
  7. 16. collection of reflected sounds from the surface in closed space
  8. 18. lowest point on transverse wave
  9. 19. reflected sound wave
  10. 20. animal uses to locate an object by means of reflected sound
Down
  1. 1. longitudinal waves that can only travel through matter
  2. 2. waves that overlap combine forming a new wave
  3. 4. region of a longitudinal wave where the particles are farthest apart
  4. 5. perception of high or low a sound seems
  5. 6. rapid back and forth motion that can occur in solids, liquids, or gases
  6. 7. highest point on transverse wave
  7. 8. passage of light through an object
  8. 12. system that uses direction of sound waves to find underwarter objects
  9. 13. matter where a wave travels
  10. 17. bouncing of a wave off a surface