Have you ever put a seashell up to your ear and heard a roaring sound the sounds sort of like the ocean? Is it magic? No! Its science! Jessi and Squeaks explain whats up!
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SOURCES:
www.wired.com/2010/11/how-do-you-hear-the-sea-in-a-shell/
wonderopolis.org/wonder/can-you-really-hear-the-ocean-in-a-shell