crossword puzzle

6. study of how sound interacts with structures
7. collection of reflected sounds from the surface in a closed space
9. lowest point on a transverse wave
11. region of a longitudinal wave where the particles are farthest apart
13. transfer of energy by a wave to the medium through which it travels
16. change of pitch when a sound source is moving in relation to an observer
18. longitudinal waves that can travel only through matter
19. perception of high or low a sound seems

1. longitudinal waves that can only travel through matter
2. rapid back and forth motion that can occur in solids,liquids,or gases
3. waves that overlap combine forming a new wave
4. distance that transfers energy from one space to another without transferring matter
5. system that uses direction of sound waves to find underwater objects
8. amount of sound energy that passes through a square meter of space in one second
10. reflected sound wave
11. bouncing of a wave off a surface
12. animal uses to locate an object by means of reflected sounds
14. passage of light through an object
15. matter where a waves travel
17. highest point on a transverse wave