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→About Sound
: '''Sounds''' are caused by materials [[Vibration|vibrating]].
: '''Sound''' has to travel through a [[medium]]. If there is no [[medium]], [[sound]] cannot get form one place to another.
: '''Sound''' travels through the [[air]] because it makes the air [[Vibration|vibrate]]. If there were no [[air ]] [[sound ]] could not travel to our [[ears]].
: '''Sounds''' can be high or low [[pitch]]ed.
: '''Sounds''' can be loud or quiet.