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Why

Why do we hear the sound of the ocean from dry seashell ?

If you hold a large seashell like a conch shell to your ear,  you will hear a sound like that of the ocean roaring. Have you wondered whether it really is the ocean ? Actually, it is not .

Seashells especially large ones have many hard curved surfaces that are good reflectors of sound. As a result sound waves that are trapped inside a dry sea shell are reflected and re-reflected, creating a jumble of echoes. These echoes create a roaring sound, very similar to the roar of the ocean.

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