noun
lava spine
Rare technical term in volcanology for a vertical, spine-like protrusion of lava.
溶岩尖塔は、火山の噴火後に見られることがある。
Lava spines can sometimes be seen after a volcanic eruption.
Compound of 溶岩 (lava) and 尖塔 (spire, steeple), literally 'lava spire'.