swallow hole
)
The physical weathering and erosion of a limestone landscape. The freezing and thawing of rain and its mild acidic properties cause cracks and joints to enlarge, forming limestone pavements, potholes, caves, and caverns.
| Hole, often found in limestone areas, through which a surface stream disappears underground. It will usually lead to an underground network of caves. Gaping Gill in North Yorkshire, England, is an example. |
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