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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