noun
Refers to molten rock expelled by a volcano, both while flowing and after solidifying.
火山から溶岩が流れ出た。
Lava flowed out from the volcano.
溶岩が冷えて固まった。
The lava cooled and solidified.
Standard modern spelling for lava.
Rarely used kanji form; 熔 is not a Jōyō kanji.
マグマ refers to molten rock underground; 溶岩 is the term for magma once it erupts onto the surface.
Compound of 溶 (melt, dissolve) and 岩 (rock). The alternative form 熔岩 uses the character 熔 (melt, fuse), which is not a Jōyō kanji.