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BONES AND TEETH
Of course, there are many necessary elements that your body needs. Calcium is super important because it gives strength to your bones and teeth.
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EARTH'S CRUST
Three percent of the Earth's crust is made of calcium. It's everywhere, but you rarely find it alone. It's almost always in some compound with other elements.
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SHELLS
Clams, oysters, and other animals in the oceans have shells. When you do a little looking, you will find out that their shells are made with Calcium. It's not pure calcium, but it adds strength the way it does in your bones and teeth.
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TEACHER'S CHALK
We're not sure if this is still true. But once upon a time, your teacher's chalk was made with calcium carbonate.
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CEMENT
Lime is an important substance when you manufacture cement and eventually concrete. We wouldn't list it here if it weren't true, but you will find that calcium is a major element in that mixture.
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NERVES AND MUSCLES
While calcium is super important to your bones and teeth, it's just as important in smaller amounts to your nerves and muscles. On an atomic level, calcium ions are used to trigger nervous and muscular activity.
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