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Chalk - Wikipedia
https://en.wikipedia.org/wiki/Chalk
WEBChalk 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.
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Chalk Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/chalk
WEBThe 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 | Properties, Composition, Formation and Uses - Geology …
https://geologyscience.com/rocks/sedimentary-rocks/chalk/
WEBOct 10, 2023 · Chalk is white or pale gray, fine-grained, and soft, with a powdery texture. It has a high calcium carbonate content, is chemically reactive, and can effervesce in contact with acids. Chalk is historically used in education and art, and its softness makes it ideal for rock climbing and gymnastics.
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Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica
https://www.britannica.com/science/chalk
WEBChalk, 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.
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Chalk: A biological limestone formed from shell debris - Geology.com
https://geology.com/rocks/chalk.shtml
WEBWhat Is Chalk? Chalk is a variety of limestone composed mainly of calcium carbonate derived from the shells of tiny marine animals known as foraminifera and from the calcareous remains of marine algae known as coccoliths. Chalk is usually white or light gray in color. It is extremely porous, permeable, soft and friable.
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Rock of ages: how chalk made England | Geology | The Guardian
https://www.theguardian.com/news/2021/feb/23/rock-of-ages-how-chalk-made-england-geology-white-cliffs
WEBFeb 23, 2021 · O n the British Geological Survey’s map, chalk is represented by a swathe of pale, limey green that begins on the east coast of Yorkshire and curves in a sinuous green sweep down the east coast,...
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CHALK | English meaning - Cambridge Dictionary
https://dictionary.cambridge.org/dictionary/english/chalk
WEBnoun. uk / tʃɔːk / us / tʃɑːk / chalk noun (ROCK) Add to word list. [ U ] a type of soft white rock. chezzzers/ iStock / Getty Images Plus/GettyImages. Geology: types of rock. …
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Chalk | Encyclopedia.com
https://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/chalk
WEBJun 8, 2018 · Earth and the Environment. Geology and Oceanography. chalk. Chalk. views 2,041,871 updated Jun 08 2018. Chalk. Background. Chalk used in school classrooms comes in slender sticks approximately .35 of an inch (nine millimeters) in diameter and 3.15 inches (80 millimeters) long.
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Chalk – Geology is the Way
https://geologyistheway.com/sedimentary/chalk/
WEBA 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.
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chalk - Students | Britannica Kids | Homework Help
https://kids.britannica.com/students/article/chalk/273588
WEBArticle. Images & Videos. Related. © AbleStock.com/Jupiterimages. In its natural state chalk is a relatively soft, white, fine-grained variety of limestone. It is composed primarily of the shells—calcium carbonate (CaCO 3 )—of microscopic one …
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