Buried deep in Greenland's ice sheet lies a puzzling chemical signature that has sparked intense scientific debate. A sharp ...

American Samoa is a United States territory which comprises the easternmost islands of a volcanic island chain formed by the ...

Hawaii's Kilauea volcano is resuming its eruption, spewing lava high into the sky from its summit crater. According to the ...

The eruption of May 18, 1980, reduced the summit of Mount St. Helens by 1,300 feet. But that was not the only geologic event that has reduced its profile. During its eruptions from 2004 to 2008, Mount ...

The southernmost active volcano on the planet is Antarctica's Mount Erebus. It is also home to Earth's only long-lived lava lakes. "Lahar" is an Indonesian word that refers to a type of volcanic flow: ...

Lava is molten rock from a volcano that reaches the Earth’s surface. Liquid rock below the Earth’s surface is referred to as magma. More than 50% of the world’s active volcanoes above sea level ...

Dick Fiske, who died on June 18 as he neared his 93rd birthday, was one of the most original thinkers ever at the USGS ...

Kilauea continued to erupt wildly on Hawaii’s Big Island this week, shooting lava hundreds of feet into the air and burning homes to the ground. As of Sunday night, 10 fissure vents were open in the ...

Klyuchevskaya Volcano on Russia's Kamchatka Peninsula is the largest active volcano in the Northern Hemisphere. A caldera is the circular depression in the center of a volcano's summit that forms ...