Echo - reflection of sound waves, Refraction - Bending of sound waves, Vibration - The creation of sound waves, Medium - A physical environment in which an event occur, Wavelength - Measurement between two consecutive rarefactions in a longitudinal wave, Mechanical - Type of energy does a sound wave have, Compression - Areas of increased pressure on a sound wave., Rarefaction - Spread out areas or areas of decreased pressure on a sound wave, Frequency - The number of wavelengths that pass a fixed point each second, Solid - Sound waves travel the fastest through this state.,

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