This view from Harry's Ridge, Wash., shows a large plume of ash burst emerging from the crater of Mount St. Helens.
Image Credit: Lyn Topinka/USGS
Orange fountains of molten lava boil from these vents on the black sea of rock at the Mauna Ulu eruption. This photo was captured on the afternoon of Oct. 15, 1970.
Image Credit: D.W. Peterson/USGS
The Ring of Fire is a U-shaped trail of volcanoes and other seismic hotspots that traces the edge of the Pacific Ocean. Most of the volcanoes within the Ring of Fire pop up along the fault lines between the massive tectonic plates that carry the continents and sea floors on their backs.
Image Credit: R.J. Wilk/USFWS
Mount Veniaminof, shown above, is a stratovolcano in Alaska's southern peninsula. Veniaminof is considered part of that flaming Pacific silhouette.
Image Credit: USFWS
This glowing lava flow took place at the Hawaii Volcanoes National Park, where a USGS photographer captured this stunning lava-fall on Feb. 7, 1972.
Image Credit: R.L. Christiansen/USGS