火か山ざん岩がん尖せん

noun

volcanic spine

A geological term for a steep-sided, pillar-like protrusion of solidified lava or volcanic rock, often formed by erosion of surrounding material.

• 火か山ざん岩がん尖せんは、火か山ざん活かつ動どうの後あとに残のこる鋭するどい