Together, they make the substance, calcium phosphate. Sidewalk chalk is made from calcium and sulfate, which makes calcium sulfate. One of the most common chemicals connected to calcium is called ...

which is calcium carbonate. Luckily, sea shells and teeth don’t dissolve in water. There is a special soft flexible plastic material that is used to fill a tooth that has a cavity. Once the plastic is ...

In the land known for having over 10,000 of these bodies of water, it takes a lot ... the lake's high levels of calcium ...

All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...