noun
pyroclastic rock
Technical term in geology for rock formed from volcanic fragments ejected during explosive eruptions.
この地域には火砕岩が広く分布している。
Pyroclastic rocks are widely distributed in this area.
Compound of 火 (ka, 'fire'), 砕 (sai, 'crush'), and 岩 (gan, 'rock'), literally 'fire-crushed rock', reflecting its formation from fragmented volcanic ejecta.