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