Sound, A form of energy produced by vibrations, Vibration, A rapid back-and-forth movement, Propagation, The movement of sound from one place to another, Medium, A material through which sound travels, Solid, A medium through which sound can travel, such as wood, Liquid, A medium through which sound can travel, such as water, Gas, A medium through which sound can travel, such as air, Vacuum, A space with no particles, where sound cannot travel

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