…Also called a cave. An underground space formed in rock, large enough for a human to enter, with the long axis of the entrance being smaller than the depth. A cave whose cross section is largest at the entrance is called a rock shelter. The most common type of natural cave is the limestone cave, which is generally called a limestone cave because it contains many secondary formations such as stalactites. Limestone caves are formed when the chemical dissolution and physical erosion of rainwater, river water, and groundwater work together to remove weak areas inside the limestone. … *Some of the terminology that refers to "Inome Cave" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…洞穴(どうけつ)ともいう。岩の中にできた地下の空間で,人間が入っていけるだけの大きさをもち,入口の長径が奥行きまたは深さより小さいもの。断面が入口のところで最大となるものは,岩陰と呼んで区別している。自然の洞窟のうちで最も数が多いのは,石灰岩の中にできる石灰洞であって,鍾乳石などの二次生成物が多く見られるので,一般に鍾乳洞と呼ばれる。石灰洞は,雨水や河川水や地下水の化学的溶食作用と物理的浸食作用とが働きあい,石灰岩内部の弱い個所を除き去った結果として形成される。… ※「猪目洞穴」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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