Soft, white, porous sedimentary rock made of calcium carbonate
This article is about the sedimentary rock. For other uses, see Chalk (disambiguation).
Chalk
Sedimentary rock
Beachy Head is a part of the extensive Southern England Chalk Formation.
Composition
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 France, and steep cliffs are often seen where they meet the sea in places such as the Dover cliffs on the Kent coast of the English Channel.
Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity. It is also used for "blackboard chalk" for writing and drawing on various types of surfaces, although these can also be manufactured from other carbonate-based minerals, or gypsum.
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...
Ant chalk, also known as Chinese chalk or 'Miraculous Insecticide Chalk', is an insecticide in the form of normal looking chalk. It contains the pesticides...
Christopher Eugene Chalk (born December 7, 1977)[citation needed] is an American actor, most famous for his role as Lucius Fox in Fox American drama series...
Chalk mining is the extraction of chalk from underground and above ground deposits by mining. Mined chalk is used mostly to make cement and bricks. Chalk...
Alexander John Gervase Chalk KC (born 8 August 1976) is a British politician and barrister serving as Lord Chancellor and Secretary of State for Justice...
Chalk streams are rivers that rise from springs in landscapes with chalk bedrock. Since chalk is permeable, water percolates easily through the ground...
The Chalk Marl is a geologic formation in England. Consisting of mixed and layered chalk and marl, it preserves fossils dating back to the Cretaceous period...
Chalk carving is the practice and shaping of chalk via carving . This article covers some methods, types of chalk, tools used and the benefits (and ramifications)...
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 Blackboards were originally made of smooth, thin sheets of black or dark...
A chalk outline is a temporary outline drawn on the ground outlining evidence at a crime scene. The outline provides context for photographs of the crime...
chalk, or sharkchalk, refers to several different kinds of liquified chalk including liquid-chalk marking pens (with water-soluble ink), liquid-chalk...
Sidewalk chalk is typically large and thick sticks of chalk (calcium sulfate, gypsum, rather than calcium carbonate, rock chalk) that come in multiple...
Chalk River (2016 population: 1029) is a small rural village, part of the Laurentian Hills municipality in Renfrew County, Ontario, Canada. It is located...
Garry Chalk (born c. 1952) is a British-born Canadian actor. He has provided the voices for Optimus Primal of Beast Wars: Transformers and Beast Machines...
Calabash chalk is a geophagic material popularly consumed in West African countries for pleasure, and by pregnant women as a cure for nausea. Geophagia...
ChalkZone is an American animated television series created by Bill Burnett and Larry Huber for Nickelodeon. The series follows Rudy Tabootie, an elementary...
The Chalk Emerald is a 37.82 carats (7.564 g) rectangular step-cut emerald, mined in Muzo, Colombia. It was one of many Colombian emeralds shipped to...
Red chalk can refer to: Sanguine for the material used for drawing Hunstanton Formation for the now obsolete stratigraphic term 'Red Chalk' employed in...
Chalk Lake is a small lake in Chaffee County, Colorado, United States adjacent to Chalk Creek in San Isabel National Forest. The lake and surrounding...
Sarah Louise Christine Chalke (/ˈtʃɔːk/; born August 27, 1976) is a Canadian actress and model. She is known for her starring roles as the second Becky...
A chalk line or chalk box is a tool for marking long, straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge...
Chalk paint is a water-based, decorative paint invented by Annie Sloan which may be applied over almost any surface. It requires very little preparation...
Chalk Hill may refer to: Chalk hill, a hill made up of chalkChalk Hill AVA, an American viticultural area in Sonoma County, California, US Chalk Hills...
Chalk River Laboratories (French: Laboratoires de Chalk River; also known as CRL, Chalk River Labs and formerly Chalk River Nuclear Laboratories, CRNL)...
Gary Chalk (born 1952) is an English illustrator and model-maker. A native of rural Hertfordshire, Chalk began playing wargames at the age of fifteen...
Japanese office supply and chalk company. It is best known for having produced the Hagoromo Fulltouch Chalk, a brand of blackboard chalk. Though mainly sold...
Chalk and Cheese was a sitcom television show, featuring Michael Crawford and Robin Hawdon. The concept began life as an earlier one-off comedy in 1977...
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