What Do You Hear in a Seashell?

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! It's science! Jessi and Squeaks explain what's up!
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SOURCES:
https://www.wired.com/2010/11/how-do-you-hear-the-sea-in-a-shell/
http://wonderopolis.org/wonder/can-you-really-hear-the-ocean-in-a-shell
http://www.physicsclassroom.com/class/sound/Lesson-5/Resonance