Chalk and seashells are made of the same thing: calcium carbonate. Shells are stronger because they have trapped proteins inside, and scientist had thought that these proteins were trapped like flies in amber. It turns out it’s way more organized than that.
Scientists know that it’s the little proteins trapped inside that makes the difference between crumbling chalk and rock-like shell. These proteins are squished down, like compressed springs. That seems like it would make the calcium carbonate more…
Here"s Why Seashells Don"t Have the Consistency of Chalk
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