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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
Mammoth Cave National Park (U. S. National Park Service) Rolling hills, deep river valleys, and the world's longest known cave system Mammoth Cave National Park is home to thousands of years of human history and a rich diversity of plant and animal life, earning it the title of UNESCO World Heritage Site and International Biosphere Region