The work confirms the theory that the pressure applied by heavy ice makes it harder for magma to reach the surface, instead ...

Obsidian, a gemstone also known as volcanic glass, is widely distributed in the Southwest. It is an extrusive igneous rock comprised of feldspar and quartz, endemic to volcanic regions.

The Japan Meteorological Agency plans to issue ashfall warnings and advisories in the event of an eruption on any of the country’s 111 active volcanoes, including Mount Fuji.