pyroclastic rock
A state of terror excited by the sudden appearance of danger; sudden and violent fear, usually of short duration; a sudden alarm.
(volcanology) Any rock formed by the accumulation of fragmented volcanic material (pyroclasts) ejected during explosive eruptions.
folded prior to some other operation
plural of finale
ハイキングコースは、踏むとザクザクと音がする黒い火砕岩の野原を横切った。
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