noun
A volcanic landform built from fragmented material ejected during eruptions. Technical term used in geology and volcanology.
火山砕屑丘は、噴火で飛び散った火山弾や火山礫が積もってできる。
A pyroclastic cone is formed by the accumulation of volcanic bombs and lapilli scattered by an eruption.
Compound of 火山 (volcano), 砕屑 (clastic, fragmentary), and 丘 (hill, cone). A modern scientific term.