volcano

This is a volcano.
この山は火山です。

a shield volcano
楯状火山 (たてじょうかざん)

pyroclastic flow

火砕流 (かさいりゅう)

a stream of heated rocks and volcanic ash

lava dome

溶岩ドーム

eruption

噴火

erupt
噴火する

Plinian eruption
プリニー式噴火

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