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Volcanoes and Volcanic Eruptions
Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
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.
Mount Vesuvius Geology, history, maps, facts and more about Vesuvius Volcano.
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.
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
The Deepest Volcano Erupting 4000 feet below the surface of the Pacific.
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.
Hawaiian Hot Spot
How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Volcanic Hazards Lava, pyroclastic density currents, lahars, gases and more.
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Stromboli Volcano Geology, history, maps, plate tectonics and more.
Igneous Rocks Descriptions and photos of common igneous rocks.
Santa Maria Volcano
Santa Maria A volcano in Guatemala. Produced one of the largest eruptions of the 1900s.
Types Of Eruptions
Types of Volcanic Eruptions A description of the most common eruption types.
Teaching Plate Tectonics Students enjoy learning with easy-to-draw illustrations.
Calderas are large volcanic craters formed by some of Earth\'s largest eruptions.
Volcanic Ash Learn about volcanic ash, volcanic dust and their impacts.
The most powerful eruption of the 20th century was blamed on the wrong volcano.
Great Rift Valley
The East Africa Rift System Volcanics and tectonics of this active rift system.
Spectacular Eruption Photos A collection of volcanic eruption photos by USGS, NASA, NOAA.
Chaiten Volcano Geology, history and facts about this explosive volcano.
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
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.
Olympus Mons The largest volcano in the solar system is on Mars.
Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.
Pavlof Volcano - an active North American volcano and a threat to air traffic.
Redoubt Volcano Lightning Photographs of lightning in the Redoubt Volcano ash cloud.
Solar System Volcanoes Earth is not the only location of volcanic activity.
Lunar Rift System
Lunar Rift System? Gravity maps revise the geologic history of the near side of the Moon.
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Volcanoes on Venus?
Volcanoes on Venus? The surface of Venus is covered by lava flows and shield volcanoes.
Arenal Volcano Geology, history, hazards, plate tectonics and more.
Redoubt Facts, history, geology, hazards and plate tectonics of this Alaskan volcano.
Galeras Volcano The most active volcano in Colombia. Article by Jessica Ball.