What is the main material that is used in making chalk?

Thanks!

Answer:
Chalk (IPA: /ˈtʃɔːk/) is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find flint nodules embedded in chalk.
calcium carbonate
chalk. it's calcium carbonate
I thought chalk was a natural formation, like the White cliffs of Dover.
Chalk is made of Calcium Carbonate (CaCO3).

One of the "veteran" teachers in our building likes to like his fingers after using chalk. He is convinced it makes a great anti-acid. I don't recommend this since you never know what may have been added to the chalk when it was produced.
the main material used in making chalk is calcium carbonate(CaCO3).

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