Volcanoes and Volcanic Eruptions

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

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

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

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.

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

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.

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

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

Igneous Rocks Descriptions and photos of common igneous rocks.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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.