A slow-moving lava flow made of glass is still inching its way down a volcano in Chile, nearly a year after it first erupted, geologists recently discovered. The lava is made of obsidian, or volcanic ...

Researchers develop a tool for measuring the viscosity of lava that could increase our understanding of molten rock as well as better improve models of its movement, giving authorities crucial ...

United States Geological Survey (USGS) scientist Mark Stelton (left) and Kenneth Sims, a UW professor of geology and geophysics and a member of the USGS Yellowstone Volcano Observatory, examine a ...