pyroclastic rock

rocks composed solely or primarily of fragments derived from explosive volcanic activity

en-GB/ˌpaɪɹəʊˈklɑːstɪk ˈɹɒk/
en-US/ˌpaɪɹəˈklæstɪk ˈɹɑk/

カテゴリ：

volcanic rockpyroclastic materialvolcaniclastic rock