vibration - Sound is caused by the __________of matter, vacuum - empty space, medium - different types of matter, conductors - tuba, microphone, metal cymbals, bells are examples of __________________, insulators - cloth, paper, pillow, ear muffs, fubber, foam, are examples of ______________ of sound, direction - sound travels in all _______________, sound - produced by the vibration of molecules traveling through a medium, frequency - pitch is determined by a sound wave's ___________, longitudinal - sound moves in this type of wave, echo - the reflection of sound waves off of a hard surface,

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