Public Release: 

Why seashells are tougher than chalk (video)

American Chemical Society

WASHINGTON, June 7, 2018 -- Seashells are made mostly of calcium carbonate, also known as chalk, a mineral soft and crumbly enough to use for sidewalk doodles. Yet seashells are tough and resilient. In this video, Reactions explains why seashells are so different, and why you can't use them to draw on your driveway: https://youtu.be/iUeMxjkSPyM.

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Reactions is a video series produced by the American Chemical Society and PBS Digital Studios. Subscribe to Reactions at http://bit.ly/ACSReactions, and follow us on Twitter @ACSreactions.

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