A substance that sound travels through. The medium can be a gas like air, a liquid like water or a solid like a guitar string., medium, Waves that travel perpendicular to the direction of the travel of energy, transverse, Waves that travel in the same direction as the energy in the wave, longitudinal, When two waves are on top of each other, they either add together to make a bigger wave, or they cancel each other out to make no waves., superpose

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