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Chemistry 15 Online
OpenStudy (anonymous):

What is the difference between chalk and limestone?

OpenStudy (chmvijay):

Limestones are a class of sedimentary rocks composed of the same mineral, calcite, which is made from calcium carbonate, or CaCO3. Despite this similarity in composition, however, not all limestone rocks are the same. Chalk is actually a special form of limestone that exhibits some differences from other rocks in the same class.

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