Volcanic activity

Japanese: 火山活動 - かざんかつどう

Volcanic activity is a phenomenon in which magma erupts from deep underground onto the surface of the earth or the ocean floor, producing a volcano, as well as all other phenomena directly related to this. In a broader sense, it also includes the process in which magma penetrates the upper part of the earth's crust and cools and solidifies to form plutonic rocks without rising to the surface. Volcanic activity.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙地下深所のマグマが地表または海底に噴出し、火山を生ずる現象、および直接これに関係して起こるすべての現象を総称していう。広義には、マグマが地殻上部に貫入し、地表に出ないで冷却固結して深成岩をつくる作用も含めていう。火山現象。火山作用。

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