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Suffosion sinkholes are normally associated with karst topography although they may form in other types of rock including chalk, gypsum and basalt. In the karst of the UK's Yorkshire Dales, numerous surface depressions known locally as "shakeholes" are the result of glacial till washing into fissures in the underlying limestone. [citation needed]
Boesmansgat (or Bushmansgat), also known in English as "Bushman's Hole", is a deep submerged freshwater cave (or sinkhole) in the Northern Cape province of South Africa, which has been dived to a depth of 282.6 metres (927 ft). Boesmansgat was believed to have first been explored by amateur diver Mike Rathbourne, in 1977.
Engelbrecht Cave (also known as North Terrace Cave, Vansittarts Cave and 5L19 & 5L20) is a cave system in the Australian state of South Australia consisting of a sinkhole with two major passages located under the Mount Gambier urban area. It is owned by the local government area of City of Mount Gambier and has
Kilsby sinkhole – in Mount Gambier, Southern Australia. Koonalda Cave – a cave located in the Nullarbor Plain in South Australia. Little Blue Lake – water-filled doline located near Mount Schank in South Australia. Numby Numby – a sinkhole located 25 to 30 kilometres (16 to 19 mi) west-northwest of Borroloola in the Northern Territory.
Bedrock is dissolved by carbonic acid in rainwater, groundwater, or humic acids from decaying vegetation, that seeps through bedding planes, faults, joints, and the like.. Over time, the surface terrain breaks up into clints separated by grikes and punctuated by sinkholes into which streams may disappear, crevices expand as the walls are dissolved to become caves or cave sy
A massive sink hole stretching 100 feet opened up in an Illinois park on Wednesday, swallowing a light pole in the middle of recreational fields and leaving a gaping, deep hole in its wake.