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==Geological formations== |
==Geological formations== |
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* [[Alvar]] structures such as occur on the [[Stora Alvaret]], [[Oland]], [[Sweden]] |
* [[Alvar]] structures such as occur on the [[Stora Alvaret]], [[Oland]], [[Sweden]] |
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* Tsingy limestone such as occur in the [[Madagascar |
* Tsingy limestone such as occur in the [[Madagascar deciduous dry forests]] |
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{{tech-stub}} |
{{tech-stub}} |
Acave-in is a collapse of a geologic formation, mine or structure which typically occurs during mining or tunneling. Geologic structures prone to cave-ins include alvar, tsingy and other limestone formations, but can also include lava tubes and a variety of other subsurface rock formations.
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