WATCH: Why seashells are tougher than chalk

By American Chemical Society —— Bio and Archives--June 7, 2018

Global Warming-Energy-Environment | Comments | Back To Full Article

WASHINGTON -- 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:

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