noun
volcaniclastic rock
Technical term in geology for rock formed from volcanic fragments. Used in academic and scientific contexts.
この地域には火山砕屑岩が広く分布している。
Volcaniclastic rocks are widely distributed in this region.
火山岩 (volcanic rock) is a broader category that includes lava flows, while 火山砕屑岩 specifically refers to rocks made of fragmented volcanic material.
Compound of 火山 (volcano), 砕屑 (clastic, fragment), and 岩 (rock). A modern scientific term.