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2. Top of the wave
6. Bottom of the wave
9. The sections where the particles in the medium are closest together are compressions.
10. The amplitude of a wave is the maximum distance that the wave moves from its rest position.
11. a disturbance that transfers energy from one place to another without transferring matter.
12. space entirely devoid of matter.
16. the regions where the particles are farthest apart are rarefactions.
17. a back-and-forth or an up-and-down movement of an object.
18. loud
19. the amount of sound energy that passes through a square meter of space in one second.
20. The human ear can detect sounds with frequencies between about 20 Hz and 20,000 Hz.
21. a longitudinal wave that can travel only through matter.
22. the number of times the pattern repeats in a given time.

1. Seismic waves are mechanical waves because they move through matter.
3. a wave in which the disturbance is perpendicular to the direction the wave travels.
4. The perception of how high or low a sound seems
5. side by side and having the same distance continuously between them.
7. above this range are called
8. A longitudinal wave causes the particles in a medium to move parallel to the direction that the wave travels.
11. The distance between one point on a wave to the same point on the next wave is the wavelength.
13. a wave that travels only through matter.
14. a straight line at an angle of 90° to a given line, plane, or surface.
15. A material in which a wave travels