Sound travels through [vibrations]. Sound travels [slower] than light which is why you can [see] a plane before you can [hear] it. Sound enters the ear through the [outer ear], then travels down the [ear canal] before reaching the [ear drum] The ear drum vibrates which causes 3 bones to move the [cochlea]. The movement of liquid in the cochlea moves [tiny hairs] on the [auditory nerve] which sends signals to the [brain]..

Complete the sentence on sound

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