Sound is a form of ____ When the string of a guitar is plucked, it moves back and forth rapidly, or ____ Sound travels through air particles in the form of ____ to reach our ears. A thin piece of skin is inside our ear acts as a drum. This is called the ____ When the sound waves strike your eardrum,these vibrations are recognized by your ____ as sound. We know that sound can travel through ____. ____ is the loudness or softness of sound. ____ is the highness or lowness of sound. Sound energy travels fastest in ____ Sound energy travels slowest in ____

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