火か山ざん砕さい屑せつ物ぶつ

noun

volcaniclastic material; pyroclastic material

Geological term for fragmented material ejected by volcanoes, including ash, lapilli, bombs, and blocks. Often used in academic and technical contexts.

• 火か山ざん砕さい屑せつ物ぶつは噴ふん火かの規き模ぼを知しる手てがかりになる。

  Volcaniclastic material provides clues to the scale of an eruption.

• この地ち層そうには多た量りょうの火か山ざん砕さい屑せつ物ぶつが含ふくまれている。

  This stratum contains a large amount of pyroclastic material.