Chalk - Wikipedia 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 of organisms, mostly microscopic plankton, which had settled to the sea floor Chalk is common throughout Western Europe, where deposits underlie parts of France, and steep cliffs are often
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CHALK Definition Meaning - Merriam-Webster 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 - Simple English Wikipedia, the free encyclopedia The Severn Sisters chalk cliffs in Sussex Blackboard chalk Chalk is a type of limestone It was made by calcareous (CaCO 3) skeletons of tiny planktonic algae called coccoliths They live in the sea in huge numbers They make chalk (CO 2) as a by-product of their photosynthesis The chalk cliffs of Dover and elsewhere were made when England was below the equator in a tropical sea It was in
Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite The sponge spicules, diatom and radiolarian tests (shells), detrital grains of quartz, and chert