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| Front | Back |
 Sound comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears. |
 Dogs can hear sound at a higher frequency than humans, allowing them to hear noises that we can’t. |
 We can hear different sounds because our ears vibrate in a similar way to the original source of the vibration. |
 Music can be defined as a meaningful arrangement of sounds. |
 Sound can't travel through a vacuum (an area of empty matter). |
 The scientific study of sound waves is known as acoustics. |
 The speed of sound is 767 miles/ 1,230 kilometers per hour. |
 A cracking noise can be heard when breaking the speed of sound. |
 Sound travels around four times faster through water than air. |
 Sound is used by many animals to detect danger, warning them of all possible attacks. |
