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