Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
Mount Rainier A dangerous volcano with a history of deadly lahars and pyroclastic flows.
Yellowstone Supervolcano Three USGS videos explain the history and eruptive activity.
Volcanic Ash Learn about volcanic ash, volcanic dust and their impacts.
Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
Mount Etna The most active volcano in Europe, continues an eruption that started in 2001.
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
||Volcanoes on Venus?
Volcanoes on Venus? The surface of Venus is covered by lava flows and shield volcanoes.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
||Hawaiian Hot Spot
How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Solar System Volcanoes Earth is not the only location of volcanic activity.
Mount Vesuvius Geology, history, maps, facts and more about Vesuvius Volcano.
|St. Helens - 30 Years
Mount St. Helens - 30 Years Two USGS videos review the eruption and its impact.
Volcanic Hazards Lava, pyroclastic density currents, lahars, gases and more.
Calderas are large volcanic craters formed by some of Earth\'s largest eruptions.
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
|Types Of Eruptions
Types of Volcanic Eruptions A description of the most common eruption types.
The Deepest Volcano Erupting 4000 feet below the surface of the Pacific.
Olympus Mons The largest volcano in the solar system is on Mars.
Chaiten Volcano Geology, history and facts about this explosive volcano.
|Santa Maria Volcano
Santa Maria A volcano in Guatemala. Produced one of the largest eruptions of the 1900s.
The most powerful eruption of the 20th century was blamed on the wrong volcano.
Stromboli Volcano Geology, history, maps, plate tectonics and more.
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
|Great Rift Valley
The East Africa Rift System Volcanics and tectonics of this active rift system.
Igneous Rocks Descriptions and photos of common igneous rocks.
Teaching Plate Tectonics Students enjoy learning with easy-to-draw illustrations.
Arenal Volcano Geology, history, hazards, plate tectonics and more.
Redoubt Volcano Lightning Photographs of lightning in the Redoubt Volcano ash cloud.
Redoubt Facts, history, geology, hazards and plate tectonics of this Alaskan volcano.
||What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.
Spectacular Eruption Photos A collection of volcanic eruption photos by USGS, NASA, NOAA.
Pavlof Volcano - an active North American volcano and a threat to air traffic.
||CO2 Rich Lavas
Carbonatite Lava Flows These carbon dioxide rich lavas are as fluid as motor oil.
Tao-Rusyr Caldera was the site of a massive volcanic eruption about 9000 years ago.
|Lunar Rift System
Lunar Rift System? Gravity maps revise the geologic history of the near side of the Moon.
Galeras Volcano The most active volcano in Colombia. Article by Jessica Ball.