1. 
   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 op http://www.ucmp.berkeley.edu/glossary/glossary_2.html
   
   
2. 
   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 op http://www.webdictionary.co.uk/definition.php?query=sinkhole
   
   
3. 
   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 op http://wordnetweb.princeton.edu/perl/webwn?s=sinkhole
   
   
4. 
   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 op http://www.britannica.com/eb/a-z/s/101
   
   
5. 
   Sinkhole
   A sinkhole, also known as a sink, snake hole, swallow hole, swallet, doline or cenote, is a natural depression or hole in the Earth`s surface caused by karst processes — the chemical dissolution of carbonate rocks or suffosion processes for example in sandstone. Sinkholes may vary in size from {c...
   Found op http://en.wikipedia.org/wiki/Sinkhole
   
   
6. 
   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 op http://www.physicalgeography.net/physgeoglos/s.html
   
   
7. 
   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 ...
   Found op http://www.cancaver.ca/docs/glossary.htm
   
   
8. 
   sinkhole
   1) Depression 2) Natural depression 3) Sink 4) Swallow hole
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/sinkhole/1
   
   

Tip: double click on a word to show its meaning.