Volcanoes and Volcanic Eruptions

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

Volcanic Hazards Lava, pyroclastic density currents, lahars, gases and more.

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

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

Mount Rainier A dangerous volcano with a history of deadly lahars and pyroclastic flows.

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

Igneous Rocks Descriptions and photos of common igneous rocks.

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

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

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

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

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

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

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

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

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

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

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

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.

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

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

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

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.

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

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

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

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

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

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

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

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.

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.

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

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

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

Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.

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

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

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