chalk

  1. a soft whitish calcite
  2. a pure flat white with little reflectance

Chalk

A soft type of limestone which when finely ground can be used to reduce soil acidity

chalk

A soft compact calcite, CaCO3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellow-white and derived chiefly from fossil seashells.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_2.html

Chalk

Chalk is a soft, white type of limestone (a sedimentary rock ). It consists mostly of calcium carbonate (CaCO3) from ancient, microscopic, single-celled marine invertebrate shells. This type of rock is very porous, soft (a hardness of 3 on the Mohs scale), and crumbly. The chalk used to draw with is actually gypsum (calcium sulfate, CaSO4-2H2O)
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Chalk

A fine grained, white calcium carbonate composed of coccoliths. Common in the Cretaceous of western Europe. The White Cliffs of Dover are a classic example of chalk cliffs.
Found on http://www.encyclo.co.uk/local/20206

chalk

[n] - a soft whitish calcite 2. [n] - a pure flat white with little reflectance 3. [n] - a piece of chalk (or similar substance) used for writing on blackboards or other surfaces 4. [v] - write, draw, or trace with chalk
Found on http://www.webdictionary.co.uk/definition.php?query=chalk

Chalk

Powder used on hands for secure grip.
Found on http://www.netfit.co.uk/glossary/fitness-glossary-c.htm

Chalk

Not regular children's chalk, this is specially designed to be safe for Scrapbooking and used in similar paper arts.
Found on http://www.encyclo.co.uk/local/20484

chalk

Soft limestone (made from gypsum) used in stick form as a drawing medium; mixed with pigment and a binding agent it is an ingredient used to make crayons. Chalk drawings exist from prehistoric times...
Found on http://www.encyclo.co.uk/local/20688

Chalk

a variety of white limestone made from tiny mud-sized particles. The Chalk forms many of the low rounded hills in the south-east of England and was formed during the Cretaceous period
Found on http://www.sedgwickmuseum.org/education/glossary.html

Chalk

White or off-white inorganic material composed of calcium carbonate. Naturally occurring, although also produced industrially throughout the twentieth century.
Found on http://www.tate.org.uk/collections/glossary/definition.jsp?entryId=472

Chalk

Chalk noun [ Anglo-Saxon cealc lime, from Latin calx limestone. See Calz , and Cawk .] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone. ...
Found on http://www.encyclo.co.uk/webster/C/51

Chalk

Chalk transitive verb [ imperfect & past participle Chalked ; present participle & verbal noun Chalking .] 1. To rub or mark with chalk. 2. To manure with chalk, as land. Morimer. 3. To make white, as wi...
Found on http://www.encyclo.co.uk/webster/C/51

chalk

Synonym: calcium carbonate. ... Origin: L. Calx ... (05 Mar 2000) ...
Found on http://www.encyclo.co.uk/local/20973

chalk

noun a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces
Found on http://wordnetweb.princeton.edu/perl/webwn?s=chalk

Chalk

• (n.) Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon. • (v. t.) To manure with chalk, as land. • (n.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having th...
Found on http://thinkexist.com/dictionary/meaning/chalk/

chalk

soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as ... [9 related articles]
Found on http://www.britannica.com/eb/a-z/c/51

Chalk

A phosphate used by climbers to aid grip on rockfaces.
Found on http://www.gooutdoors.co.uk/glossary

Chalk

Calcium carbonate
Found on http://www.translationdirectory.com/glossaries/glossary071.htm

chalk

Type: Term Pronunciation: chawk Synonyms: calcium carbonate
Found on http://www.medilexicon.com/medicaldictionary.php?t=16448

Chalk

soft, white, porous sedimentary rock, a form of limestone composed of calcite coccolith plates.
Found on http://en.wikipedia.org/wiki/Glossary_of_geology

Chalk

Form of limestone. This sedimentary rock is composed of the shells and skeletons of marine microorganisms.
Found on http://www.physicalgeography.net/physgeoglos/c.html

chalk

Chalk cliffs, Dorset, England A soft, porous form of limestone, composed mainly of calcium carbonate (CaCO3, see calcium) with varying amounts of silica, quartz, feldspar, or other impurities. Chalk is generally gray-white or yellow-white and is derived chiefly from the r...
Found on http://www.daviddarling.info/encyclopedia/C/chalk.html

chalk

chalk, mineral of calcium carbonate, similar in composition to limestone, but softer. It is characteristically a marine formation and sometimes occurs in great thickness; the chief constituents of these chalk deposits are the shells of minute animals called foraminiferans. Chalk has been laid down i...
Found on http://www.infoplease.com/ce6/sci/A0811242.html

Chalk

Chalk is a pure soft limestone, opaque white, and usually formed by the accumulation of the shells of foraminifera together with those of larger marine organisms. Chalk is found in large quantities in land masses which were at one time covered by the sea. Chalk is composed of between 50 and 98 percent calcium carbonate and various of minerals inclu...
Found on http://www.probertencyclopaedia.com/browse/HC.HTM
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