噴ふん石せき

noun

volcanic ejecta; tephra; cinders; scoria

Refers to solid material ejected during a volcanic eruption, such as cinders, scoria, and other pyroclastic fragments. Used in geological and disaster-related contexts.

• 噴ふん石せきが火か口こうから飛とび出だした。

  Volcanic ejecta flew out of the crater.

• 登と山ざん中ちゅうに噴ふん石せきに当あたらないように注ちゅう意いしてください。

  Be careful not to be hit by volcanic cinders while climbing.