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 …

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.

May 9, 2019 · Chalk is a soft, white sedimentary rock formed from marine microfossils. Learn its formation, mineral composition, properties, famous deposits, and uses.

Chalk is a natural fine-grained limestone that was formed slowly as a deposit in water greater than 150 feet (50 meters) deep. The fine-grain particles in natural chalk are typically the remains of tiny marine …

: a prepared form of chalk or a material resembling chalk especially when used (as for writing on blackboards) as a crayon

A chalk is a soft, friable variety of limestone consisting of poorly lithified calcareous ooze, produced by the accumulation of planktonic organisms in a pelagic (open sea) environment.

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.

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 …

Nov 18, 2023 · Chalk is primarily composed of calcium carbonate (CaCO 3), a naturally occurring mineral. Calcium carbonate is a white, insoluble solid that forms the basis of many types of limestone …

Chalk is a sedimentary rock that is formed through the accumulation and compression of the skeletal remains of microscopic marine plankton, such as coccolithophores and foraminifera. These …