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Calcite (calcium carbonate) 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. Chalk is common throughout Western Europe, where deposits underlie parts of ...
Chelsea is a female given name of 20th-century coinage. It is pronounced / ˈtʃɛlsi /, / tʃɛlˈseɪ / or / ˈtʃɛlsiə /, and sometimes spelled Chelsie or Chelsey. In the United States, the spelling "Chelsea" first entered the Social Security Administration baby naming data chart in 1969 at position 708. It rose in popularity among names ...
Rock Chalk is a transposition of “chalk rock,” a type of limestone that exists in the Cretaceous-age bedrocks of central and western parts of the state and which is similar to the coccolith -bearing chalk of the white cliffs of Dover. (The University itself is located on top of Mount Oread, a ridge of flinty Carboniferous limestone used in ...
Lime (material) Lime is an inorganic material composed primarily of calcium oxides and hydroxides. It is also the name for calcium oxide which occurs as a product of coal-seam fires and in altered limestone xenoliths in volcanic ejecta. [1] The International Mineralogical Association recognizes lime as a mineral with the chemical formula of CaO ...
Chalk art by kids in the Czech Republic. On September 16–17, 2006, a global event was held to promote peace through sidewalk chalk drawings. [5] Chalk4Peace was a project planned by an artist from Arlington, Virginia named John Aaron, who asked children and teens from the age of eight to age eighteen to participate in groups across the world to draw chalk drawings that would illustrate peace ...
Uses. Reusable writing surface on which text or drawings are made. 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, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
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Chalk (military) In military terminology, a chalk is a group of paratroopers or other soldiers that deploy from a single aircraft. [1] A chalk often corresponds to a platoon -sized unit for air assault operations, or a company -minus-sized organization for airborne operations. For air transport operations, it can consist of up to a company-plus ...