Look up: Chalk

1. 
   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/gl
   
   
2. 
   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/subject
   
   
3. 
   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.
   Found on http://www.encyclo.co.uk/nol.php
   
   
4. 
   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.geologyrocks.co.uk/glossary/l
   
   
5. 
   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/definitio
   
   
6. 
   Chalk
   Powder used on hands for secure grip.
   Found on http://www.netfit.co.uk/glossary/fitness
   
   
7. 
   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.scrapdirectory.co.uk/scrapboo
   
   
8. 
   Chalk
   A soft type of limestone which when finely ground can be used to reduce soil acidity
   Found on http://www.unwinsdirect.co.uk/?PAGEID=42
   
   
9. 
   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.thehistorychannel.co.uk/site/
   
   
10. 
    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/
    
    
11. 
    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/gloss
    
    
12. 
    chalk
    naturally occurring variety of calcium carbonate Category: Mining
    Found on http://www.mijnwoordenboek.nl/definition
    
    
13. 
    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. 2. (Fine Arts) Finely prepared chalk, used as a drawing implement; also, by extension, ...
    Found on http://www.encyclo.co.uk/webster/C/51
    
    
14. 
    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 with chalk; to make pale; to bleach. Tennyson. « Let a bleak paleness chalk the ...
    Found on http://www.encyclo.co.uk/webster/C/51
    
    
15. 
    chalk
    Synonym: calcium carbonate. ... Origin: L. Calx ... (05 Mar 2000) ...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
16. 
    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://wordnet.princeton.edu/perl/webwn?
    
    
17. 
    chalk
    noun a pure flat white with little reflectance
    Found on http://wordnet.princeton.edu/perl/webwn?
    
    
18. 
    chalk
    noun a soft whitish calcite
    Found on http://wordnet.princeton.edu/perl/webwn?
    
    
19. 
    chalk
    verb write, draw, or trace with chalk
    Found on http://wordnet.princeton.edu/perl/webwn?
    
    
20. 
    Chalk
    `Chalk` is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find flint and chert nodules embedded in chalk. Chalk is relatively resistant to erosion and slumping compared to the clays with which it is usually associated, ...
    Found on http://en.wikipedia.org/wiki/Chalk
    
    
21. 
    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
    
    
22. 
    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
    
    
23. 
    Chalk
    Form of limestone. This sedimentary rock is composed of the shells and skeletons of marine microorganisms.
    Found on http://www.physicalgeography.net/physgeo
    
    
24. 
    chalk
    
    1. a soft whitish calcite
    2. a pure flat white with little reflectance
    
    Found on
    
    
25. 
    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/encyclopedi