UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

1. The collapse of the ceiling or side walls of a cave or of the land surface into a subterranean passage as a result of undermining or of pressure from above [10]. 2. The partial or complete collapse of earth material into a large underground opening, such as an excavation or a mine. 3. The sudden slumping of wall material into a pit. 4. A place where material has collapsed or fallen in or down.