Volcanoes and Volcanic Eruptions

Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.

Spatter Cones are small, steep, volcanic cones built of welded basaltic lava.

Mount St. Helens - 30 Years Two USGS videos review the eruption and its impact.

Mount Etna The most active volcano in Europe, continues an eruption that started in 2001.

Yellowstone Supervolcano Three USGS videos explain the history and eruptive activity.

Mount Vesuvius Geology, history, maps, facts and more about Vesuvius Volcano.

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.

Igneous Rocks Descriptions and photos of common igneous rocks.

Where Are the Canary Islands? Off the northwest coast of Africa, 60 miles west of Morocco.

Cinder Cones are the smallest, simplest, and most common type of volcano.

Calderas are large volcanic craters formed by some of Earth\'s largest eruptions.

The East Africa Rift System Volcanics and tectonics of this active rift system.

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.

Gifts That Rock - What are the most popular gift items in the Geology.com store?

Volcanic Ash Learn about volcanic ash, volcanic dust and their impacts.

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.

Teaching Plate Tectonics Students enjoy learning with easy-to-draw illustrations.

Solar System Volcanoes occur on Earth and moons of Jupiter, Saturn and Neptune.

Spectacular Eruption Photos A collection of volcanic eruption photos by USGS, NASA, NOAA.

Types of Volcanic Eruptions A description of the most common eruption types.

Pele*s Hair and Pele*s Tears are two unusual types of lava found at Kilauea and other volcanoes.

Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.

Santa Maria A volcano in Guatemala. Produced one of the largest eruptions of the 1900s.

Olympus Mons The largest volcano in the solar system is on Mars.

Chaiten Volcano Geology, history and facts about this explosive volcano.

Stromboli Volcano Geology, history, maps, plate tectonics and more.

Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.

The most powerful eruption of the 20th century was initially blamed on the wrong volcano.

Redoubt Volcano Lightning Photographs of lightning in the Redoubt Volcano ash cloud.

The Next Hawaiian Island could be growing in the Pacific Ocean right now. Its name is Lo'ihi.

What is a Maar? The second most common volcanic landscape feature on Earth.

Kilauea Eruption - photos of the 2018 eruption in the East Rift Zone of Kilauea Volcano.

Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.

Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.

Redoubt Facts, history, geology, hazards and plate tectonics of this Alaskan volcano.

Lunar Rift System? Gravity maps revise the geologic history of the near side of the Moon.

Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.

Pavlof Volcano - an active North American volcano and a threat to air traffic.

Mount Agung is an active and dangerous volcano on the island of Bali, Indonesia.

Volcanoes on Venus? The surface of Venus is covered by lava flows and shield volcanoes.

Kick 'em Jenny is a submarine volcano and one of the most active on the Caribbean plate.

Arenal Volcano Geology, history, hazards, plate tectonics and more.

Galeras Volcano The most active volcano in Colombia. Article by Jessica Ball.