1) Collapse of a cavern roof 2) Depression 3) Drainage depression 4) Natural depression 5) Sink 6) Swallow hole
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https://www.crosswordclues.com/clue/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...
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http://en.wikipedia.org/wiki/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.
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http://www.americantrails.org/
topographic depression formed as underlying limestone bedrock is dissolved by groundwater. It is considered the most fundamental structure of karst ... [2 related articles]
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http://www.britannica.com/eb/a-z/s/101
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'.)
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http://www.cancaver.ca/docs/glossary.htm
Natural depression that connects with a subterranean passage, generally occurring in limestone regions.
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http://www.encyclo.co.uk/local/22218
A circular, often funnel-shaped depression in the ground that forms when soluble rocks dissolve.
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http://www.encyclo.co.uk/local/22291
A depression in the land surface that results from the collapse or slow settlement of underground vo
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http://www.encyclo.co.uk/local/22392
A depression formed by the collapse of a cavern roof.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
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.
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http://www.physicalgeography.net/physgeoglos/s.html
A limestone hole into which a stream disappears.
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http://www.quick-facts.co.uk/earth/glossary.html
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.
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http://www.scientificpsychic.com/etc/geology-glossary.html
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.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
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
[
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
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http://www.webdictionary.co.uk/definition.php?query=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
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https://www.encyclo.co.uk/local/20974
Depression in ground surface caused by collapse into a cave below.
Found on
https://www.encyclo.co.uk/local/22327
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.
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https://www.encyclo.co.uk/local/22449
A surface depression caused by a collapse of soil or overlying formation above fractured or cavernous bedrock.
Found on
https://www.encyclo.co.uk/local/22548
No exact match found.
