Reactions

How Seashells Are Made

09/10/2018 | 3m 43s | Video has closed captioning.

If you know that seashells are made of basically the same stuff as chalk, you might have wondered why chalk is crumbly but seashells are super tough. This week on Reactions, we explain: The secret’s in the biochemistry.

Aired: 09/10/18

Rating: NR

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Problems Playing Video? | Closed Captioning