sinkhole

A circular, often funnel-shaped depression in the ground that forms when soluble rocks dissolve.
Found on http://www.encyclo.co.uk/local/22291

Sinkhole

A sinkhole, also known as a sink, sink-hole, shakehole, swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer. Some are caused by karst processes—for example, the chemical dissolution of carbonate rocks or suf...
Found on http://en.wikipedia.org/wiki/Sinkhole

sinkhole

sink noun a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Found on https://www.encyclo.co.uk/local/20974

Sinkhole

A depression formed by the collapse of a cavern roof.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

sinkhole

a depression in the Earth's surface caused by dissolving of underlying limestone, salt, or gypsum. Drainage is provided through underground channels that may be enlarged by the collapse of a cavern roof.
Found on http://ga.water.usgs.gov/edu/dictionary.html

sinkhole

a depression in the Earth's surface caused by dissolving of underlying limestone, salt, or gypsum. Drainage is provided through underground channels that may be enlarged by the collapse of a cavern roof.
Found on http://www.translationdirectory.com/glossaries/glossary006.htm

Sinkhole

A depression in the land surface that results from the collapse or slow settlement of underground vo
Found on http://www.encyclo.co.uk/local/22392

sinkhole

A limestone hole into which a stream disappears.
Found on http://www.quick-facts.co.uk/earth/glossary.html

sinkhole

A natural depression in the surface of the land caused by the collapse of the roof of a cavern or subterranean passage, generally occurring in limestone regions.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html

Sinkhole

A natural occurrence when the limestone crust of the earth collapses and creates a crater. Old sinkholes are often filled with water and resemble ponds.
Found on http://www.americantrails.org/

Sinkhole

A pit like hole in found in areas of karst. These features are caused by the weathering of limestone or dolomite by subsurface drainage. Also called a sink or doline.
Found on http://www.physicalgeography.net/physgeoglos/s.html

Sinkhole

A surface depression caused by a collapse of soil or overlying formation above fractured or cavernous bedrock.
Found on http://www.epa.gov/oecaagct/ag101/cropglossary.html

sinkhole

A word of American origin used to describe sites of sinking water in a carbonate rock (karst) area; often formed in a doline. Sinkholes also include swallets, and like dolines, can be mantled in by subsequent glacial drift deposits. (In the UK and other parts of Europe, a sinkhole is often referred to as a 'swallowhole'.)
Found on http://www.cancaver.ca/docs/glossary.htm

sinkhole

Depression in ground surface caused by collapse into a cave below.
Found on https://www.encyclo.co.uk/local/22327

sinkhole

n. A natural depression in the surface of the land caused by the collapse of the roof of a cavern or subterranean passage, generally occurring in limestone regions.
Found on http://www.ucmp.berkeley.edu/glossary/gloss2geol.html

sinkhole

n. A natural depression in the surface of the land caused by the collapse of the roof of a cavern or subterranean passage, generally occurring in limestone regions.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_2.html

Sinkhole

Natural depression that connects with a subterranean passage, generally occurring in limestone regions.
Found on http://www.encyclo.co.uk/local/22218

sinkhole

topographic depression formed as underlying limestone bedrock is dissolved by groundwater. It is considered the most fundamental structure of karst ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/s/101

sinkhole

[n] - a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Found on http://www.webdictionary.co.uk/definition.php?query=sinkhole
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