A volcano that erupted after being asleep for more than 100,000 years is leading more volcanologists to say we must redefine ...

(CNN) — Here's some background information about volcanoes, mountains that open downward to a reservoir of molten rock. Facts: More than 80% of the Earth's surface, both above and below sea level, is ...

Most volcanoes form at the boundaries of Earth's tectonic plates, which are huge slabs of crust and upper mantle that fit together like puzzle pieces. Think of these plates as massive rafts floating ...

This photo provided by the U.S. Geological Survey shows the summit lava lake of Hawaii's Kilauea volcano on May 6, 2018. By analyzing the dynamics of a string of explosions that happened during the ...

Is there anything more spectacular than a towering lava fountain? Think about what it is: glowing red molten rock being shot into the sky, potentially hundreds or thousands of feet. As ubiquitous and ...

Mount Lassen, in the southern Cascades, erupted on May 22, 1915, 65 years almost to the day before Mount St. Helens. Also known as Lassen Peak, the mountain is the southernmost active volcano in the ...