Encyclopedia > Limestone

  Article Content

Limestone

Limestone is a sedimentary rock, mainly composed of mineral calcite. The primary source of the calcite is usually marine organisms, which settle out of the water column and are deposited on the ocean floors as pelagic[?] ooze (but see lysocline for information on calcite dissolution). Secondary calcite may also be deposited in super-saturated meteoric[?] waters, as is evidenced by the creation of stalagmites and stalactites.

Bands of limestone emerge from the Earth's surface in often spectacular rocky outcrops and islands. For example the Verdon Gorge[?] in France, Malham Cove in North Yorkshire, England and the Ha Long Bay[?] National Park in Vietnam.

It is quarried for roadbeds and gravel roads, building and landscape construction, and cement manufacture.

See also: marble, list of minerals, karst.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
John Lloyd (writer)

... (who wrote all the rest solo). He also wrote Hordes of the Things (as J. H. W. Lloyd) with Andrew ("A. P. R.") Marshall[?]. He worked as a TV producer at BBC 1979-1989 and ...