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Sink holes are surface subsidence structures that form due to the collapse of underground voids. These voids may form naturally (e.g. due to the dissolution of rocks such as limestone or gypsum by groundwater) or be man made (e.g. mine workings). The surface subsidence pit can vary greatly in depth and diameter from less than a metre wide and 1/2 a metre deep to tens of metres in diameter. They don't swallow people up, however it would be possible for a person to fall into one of these features. There have also been occurrences where they have formed under or close to buildings causing instability and even collapse.
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∙ 13y ago
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