Toad (topography) - Toad

Japanese: がま(地形) - がま
Toad (topography) - Toad

… refers to a cavity formed in a rock or mineral vein, and is commonly called a "cavity" in mines. Cavities may also be formed by the separation of specific components by other geological processes after the formation of a rock, in which case they are called heterogeneous cavities. …

*Some of the terminology explanations that mention "gama (topography)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…岩石や鉱脈の中に生成している空洞をいい,鉱山などでは俗称で〈がま〉ともいわれる。岩石の生成後に別の地質作用による特定の成分の分別によって空洞を生ずる場合もあるが,この場合は異質晶洞と呼ぶ。…

※「がま(地形)」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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