Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts …

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Jan 16, 2026 · Chalk is a soft, white sedimentary rock formed from marine microfossils. Learn its formation, mineral composition, properties, famous deposits, and uses.

4 days ago · The meaning of CHALK is a soft white, gray, or buff limestone composed chiefly of the shells of foraminifers. How to use chalk in a sentence.

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Chalk is a soft, white, porous type of sedimentary rock. It is a form of limestone that is naturally created from the fossilised skeletons of tiny marine organisms, such as plankton called coccolithophores.

A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, better known as chalk.

Jan 12, 2026 · Chalk is a fine-grained variety of limestone, typically containing minor amounts of silt and clay as impurities. The mineral calcite is an ionic salt that reacts with acid to produce carbon dioxide …

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