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SOUND

Sound. Sound is a wave.Sound is the vibration of air molecules.Sound travels the slowest in air, next is liquids, and then the fastest in solids.Sound waves transfer sound energy.The speed of sound through air is 340m/s.An echo is a sound wave that strikes a surface that has a different density

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SOUND

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    1. (((SOUND))) Levi Malan 9 July 2012

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