溶よう岩がん流りゅう

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Meanings

1

noun

lava flow

Refers to a stream of molten rock moving down a volcano or the resulting solidified formation.

溶よう岩がん
溶岩 is lava in general, while 溶岩流 specifically refers to a flowing stream or the resulting formation.
火か砕さい流りゅう
火砕流 is a pyroclastic flow, a fast-moving mixture of hot gas and volcanic material, distinct from a lava flow.

Compound of 溶岩 (lava) and 流 (flow).