wavelength, top of one wave to the top of another wave, rarefaction, where waves are spread out, compression, where the waves are close together, energy direction, direction the wave is travelling, Oscillating direction, direction the wave vibrates, Longitudinal wave, a wave vibrating in the direction of propagation, amplitude, the measurement from the equilibrium to the crest, crest, highest point of a wave, equilibrium, the middle of the wave, trough, the lowest point of the wave

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