volcanic clast的用法和樣例：
例句
- A perfact Carboniferous reef complex developed on top of a volcanic seamount on the oceanic floor in the Akiyoshi Terrane, Southwest Japan.
一個完好的石炭紀生物礁發育在日本秋吉地區的玄武岩熔岩和火山碎屑岩之上。 - The volcanic successions comprise thick piles of basaltic lavas and subordinate intermediate and silicic lavas and pyroclastics.
該火山岩系的組成以玄武質熔岩為主，其次有中性和酸性熔岩及火山碎屑岩。
