Jisho

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ざんさいせつがん 火山砕屑岩
Noun
1. volcaniclastic rock
Wikipedia definition
2. Pyroclastic rockPyroclastic rocks or pyroclastics (derived from the Greek: πῦρ, meaning fire; and κλαστός, meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked through mechanical action, such as by wind or water, these rocks are termed volcaniclastic.
Read “Pyroclastic rock” on English Wikipedia
Read “火山砕屑岩” on Japanese Wikipedia
Read “Pyroclastic rock” on DBpedia

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