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Sound travels when the molecules in the ( medium, ear drum, transmit, cochlea ) vibrates. The closer the molecules are, the ( faster, slower, more curved ) sound travels. The fastest medium is a ( solid, liquid, gas, vacuum ) while sound does not travel in a ( vacuum, solid, liquid, gas ). In the ear, a vibrating object e.g. a trumpet produces waves. Sound then travels from the ( medium, vacuum, air, ear ) (air) to the ear. The vibrating air enters the ear, fuelled to the ( ear canal, optic nerve, cochlea, ossicles, drum ). The vibrating air sets up vibrations in the ( ear drums, ear canal, auditory nerve, vacuum, cochlea ). The ear drums then transmit the vibrations to the small bones called ( ossicles, cochlea, ear canal, ear drums ), causing them to vibrate. The ( cochlea, ear drums, ossicles, vacuum, auditory nerve ) vibrates. These vibrations are detected by the hair lining and the ( auditory nerve, cochlea, ear drums, ossicles, ear canal ) will then detect these vibrations and send the impulses to the brain.