Translation guide
A lava dome is a mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. In Japanese, the most common term is 溶岩ドーム, but other related terms exist depending on context.
Referring to the volcanic landform itself, a mound of viscous lava.
A more technical term, literally 'lava round-top hill'. Used in academic or formal contexts.
There are many lava domes in this area.
Dome-shaped lava was observed.