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Bookmark or Share- What is a sinkhole? | U.S. Geological Survey - USGS.govA sinkhole is a depression in the ground with no external drainage, often caused by dissolution of soluble rocks by groundwater. Learn more about sinkholes, how they form, and where they occur from the U.S. Geological Survey.
- Sinkholes | U.S. Geological Survey - USGS.govSinkholes are areas of ground with no external drainage that can form when the rock below is dissolved or eroded by water. Learn about the different types of sinkholes, how they are caused by natural or human activities, and see photos and maps of sinkhole-prone areas.
- Sinkhole - Education | National Geographic SocietyA sinkhole is a hole in the ground that forms when water dissolves surface rock, especially limestone. Learn about the types, causes, and effects of sinkholes, and see photos and examples of natural and human-made sinkholes.
- How Sinkholes Work - HowStuffWorksSinkholes are much more than holes in the ground. Learn how sinkholes can cause the Earth to swallow up you, your home and your car.
- Sinkhole - WikipediaA sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.
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