- Cave | Definition, Formation, Types, Facts | Britannica
Cave, natural opening in the earth large enough for human exploration Such a cavity is formed in many types of rock and by many processes The largest and most common caves are those formed by chemical reaction between circulating groundwater and bedrock composed of limestone or dolomite
- Caves, Information and Facts - National Geographic
A veil of darkness cloaks the natural beauty of caves Some are found in cliffs at the edge of the coastline, chipped away by the relentless pounding of waves Others form where a lava tube's
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