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Wikipedia definition
1. SpeleologySpeleology (also spelled spelæology or spelaeology) is the scientific study of caves and other karst features, their make-up, structure, physical properties, history, life forms, and the processes by which they form and change over time (speleomorphology). The term speleology is also sometimes applied to the recreational activity of exploring caves, but this is more properly known as caving, spelunking or potholing.
Read “Speleology” on English Wikipedia
Read “洞穴学” on Japanese Wikipedia
Read “Speleology” on DBpedia

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