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Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor.
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.
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.
Jun 13, 2024 · 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.
Oct 10, 2023 · Chalk is a soft, white, porous, sedimentary rock composed primarily of the mineral calcite (calcium carbonate). It is often associated with marine environments and is characterized by its distinctive white color and powdery texture.
Chalk is a biological limestone derived from the tiny calcium carbonate shells of foraminifera and the calcareous remains of marine algae. It is soft, friable, porous, permeable and usually white to light gray in color.
CHALK definition: 1. a type of soft white rock 2. a stick of this rock or a similar substance used for writing or…. Learn more.
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.
Apr 23, 2024 · Chalk is a pure type of limestone composed of tiny shells of marine organisms. Deposits are found worldwide, but in England the geological ripples from the rising of the Alps some 40 million...
1 day ago · Four protesters who were jailed for writing anti-police graffiti in chalk on a temporary barricade near a Seattle police precinct have been awarded nearly $700,000 after a federal court jury ...
