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air vibrate airplan amplifies animals Ask a friend Bats birds blindfolded body Bouncing Back brains bullhorn called catch circle clap close cone Croaking cupping your hands dark Different Sounds direction Dolphins dominoes drum vibrate ear trumpet eardrum echoes erupted faster than sound Frog guitar Half a mile hear the sound heard hearing aids high note hold holes inside large ears Light moves liquid listen Loud louder low note male messages mouth musical instruments nice noise Opera Singer Oscilloscope pack particles bump pass person pipe plastic play player poor hearing quickly quiet sound rabbit Rattlesnake recorder seabed short shout SIGHT singing skin solid object Sonar sound is coming Sound moves sound to travel sound travels sound vibrations Sound waves travel spread Stretch string sugar talking normally tell thing three seconds throat tight tightly tiny tray Try talking tube violin vocal cords voice Walk warn