*What is Sound ?
//Communication through sound,tone,& intonation,expression your mood & desire in the speech. Many animals especially aquatic animal, use sound to find their way in deep water.Sound travels in the from of longitudinal waves. There waves are generated when air molecules vibrate & moves in a pattern. For example ,when you clap your hands , the sound waves produced travel to your brain through ear.The brain recognizes the sound & identifies the action.