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Videos
Volcanologist Janine Krippner dives into the details of how volcanoes work and the...
Video: Encyclopædia Britannica, Inc.
Jess Phoenix has worked on the Kawa Aegean volcano in Indonesia, the site of the...
Video: Encyclopædia Britannica, Inc.
Learn about the different kinds of volcanic eruptions.
Video: Encyclopædia Britannica, Inc.
Volcanic activity at Kilauea in Hawaii.
Video: Encyclopædia Britannica, Inc.
At the margins of Earth's plates, where two plates pull apart or one plate dives...
Video: Encyclopædia Britannica, Inc.
Learn about the ancient Roman city of Pompeii, which was buried in volcanic ash when...
Video: Encyclopædia Britannica, Inc.
Spectacular fountainlike eruptions at Kilauea volcano, Hawaii, are followed by streams...
Video: Encyclopædia Britannica, Inc.
Crater Lake is located within a huge volcanic caldera in the Cascade Range of southwestern
Oregon....
Video: Encyclopædia Britannica, Inc.
The eruption of Paricutín lasted for nine years and produced one of the world's youngest...
Video: Encyclopædia Britannica, Inc.
Lava flowing toward the sea from Kilauea volcano, Hawaii, takes two recognizable...
Video: Encyclopædia Britannica, Inc.
Geysers in Yellowstone National Park, northwestern Wyoming, U.S.
Video: Encyclopædia Britannica, Inc.
Molten sulfur and volcanic gases bubbling out of an undersea vent near the Mariana...
Video: Major funding for this expedition was provided by NOAA Ocean Exploration Program and NOAA Vents Program; video clips edited by Bill Chadwick, Oregon State University/NOAA
A computer visualization of the process by which volcanic island chains are formed....
Video: Displayed by permission of The Regents of the University of California. All rights reserved. (A Britannica Publishing Partner)
Beginning in November 1963, an eruption of ash and lava from the seafloor off the...
Video: Encyclopædia Britannica, Inc.
An overview of Io, a moon of Jupiter with many active volcanoes.
Video: © Open University (A Britannica Publishing Partner)
Learn what caused the final destruction of the ancient city of Selinus, Sicily.
Video: Contunico © ZDF Studios GmbH, Mainz
John Rafferty, associate editor of Earth sciences at Encyclopædia Britannica, discusses...
Video: Encyclopædia Britannica, Inc.
Images
Mount St. Helens volcano, viewed from the south during its eruption on May 18, 1980.
© Getty Images
Stratovolcanoes tend to form at subduction zones, or convergent plate margins, where...
Encyclopædia Britannica, Inc.
Volcanoes and thermal fields that have been active during the past 10,000 years.
Encyclopædia Britannica, Inc.
A helicopter-borne “smart spider” sensor sitting on a ridge of Mount St. Helens,...
US Geological Survey
Pahoehoe lava flow, Kilauea volcano, Hawaii, November 1985. Pahoehoe lava flows are...
J. D. Griggs, U. S. Geological Survey
A cloud of ash and pumice rises into the air on July 22, 1980, following an explosive...
Mike Doukas/U.S. Geological Survey
Buildings and vegetation at Clark Air Base, Philippines, destroyed by a thick, wet...
Willie Scott/U.S. Geological Survey
Earth's atmosphere showing the Mount Pinatubo dust layer, photographed from the U.S....
NASA/Johnson Space Center
Volcanic eruptions may fall into six major types: Icelandic, Hawaiian, Strombolian,...
Encyclopædia Britannica, Inc.
A column of gas and ash rising from Mount Pinatubo in the Philippines on June 12,...
David H. Harlow/U.S.Geological Survey
Basaltic lava erupting from the Pu'u 'O'o spatter and cinder cone on Kilauea volcano,...
J.D. Griggs/U.S. Geological Survey
Colour lithograph of the eruption of Krakatoa (Krakatau) volcano, Indonesia, 1883;...
Hulton Archive/Getty Images
The landforms shown at left and right are vertically exaggerated, and those shown...
Encyclopædia Britannica, Inc.
Momotombo Volcano (left) and Momotombito Island, viewed across Lake Managua, Nicaragua.
Byron Augustin/D. Donne Bryant Stock
Ol Doinyo Lengai, volcano near Lake Natron, northern Tanzania.
Robert Francis/Robert Harding Picture Library
Computer-generated image of the summit area of Lō‘ihi, a submarine volcano southeast...
Image courtesy of John R. Smith, Hawai'i Undersea Research Lab at SOEST, University of Hawai'i/ Encyclopædia Britannica, Inc.
Volcano Island rises from Taal Lake, which fills a broad, shallow caldera created...
Peter Mouginis-Mark, Hawaii Institute of Geophysics and Planetology, University of Hawaii
Eruption of Cerro Negro volcano, Nicaragua, November 1969. Cerro Negro is a cinder...
U.S. Department of the Interior, Geological Survey
The lava dome of Mount St. Helens, May 16, 1984. Following the great eruption of...
Courtesy of the U.S. Geological Survey; photograph, Lyn Topinka
Groundwater percolates through porous rock into fractures deep underground, where...
Encyclopædia Britannica, Inc.
Old Faithful geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, U.S.
George Marler/National Park Service
Ring of Fire, the belt of active volcanoes, volcanic arcs, and tectonic plate boundaries...
Encyclopædia Britannica, Inc.
Global seismic centres for earthquakes of magnitude 5.5 and greater occurring between...
Encyclopædia Britannica, Inc.
Eruption of Kilauea, Hawaii Volcanoes National Park, Hawaii, 1983.
J.D. Grigg/U.S. Geological Survey
The summit of a partially submerged volcano forms the outline of Kraternaya Bay,...
Michael V. Propp
The Martian volcano Arsia Mons, the southernmost of the line of three volcanoes on...
Courtesy of the U.S. Geological Survey, Flagstaff, Arizona
Olympus Mons, the largest volcano on Mars. The volcano is about 600 km (370 miles)...
Photo NASA/JPL/Caltech (NASA photo # PIA00300)
Olympus Mons, Mars's tallest volcano, imaged by the Mars Global Surveyor spacecraft...
Photo NASA/JPL/Caltech (NASA photo # PIA01476)
Olympus Mons, the highest point on Mars, in a computer-generated oblique view made...
NASA/JPL/MOLA Science Team
Tharsis region, northern hemisphere of Mars. Olympus Mons is visible on the left;...
Photo NASA/JPL/Caltech (NASA photo # PIA01435)
Farmer on a water buffalo in a ripening rice field near Mayon Volcano, southern Luzon,...
Shostal Associates
Mount Bromo (foreground) and Mount Semeru (background), two active volcanoes in eastern...
© Todikromo—iStock/Getty Images Plus
Eruption of Mount Merapi, Central Java, Indonesia, May 2006.
© Weda—EPA/REX/Shutterstock.com
Mount Pinatubo erupts in June 1991. The heavy ashfalls resulting from the eruption...
© T. J. Casadevall/U.S. Geological Survey
Figure 2: The north face of Mt. St. Helens in June 1970. The summit elevation was...
R.W. Decker
Before-and-after images of a volcanic eruption on Jupiter's moon Io, made by the...
Photo NASA/JPL/Caltech (NASA photo # PIA00744)
Gases rising from the Tungurahua volcano in Ecuador during the volcano's eruption...
© GlobetrotterJ/Shutterstock.com
Idunn Mons, a volcano on Venus, seen in an image created from data obtained by NASA's...
NASA/JPL/ESA
Idealized drawing of a porphyry copper deposit, showing the relationship between...
Encyclopædia Britannica, Inc.
The world's earthquake zones occur in red bands and largely coincide with the boundaries...
Encyclopædia Britannica, Inc.
The eruption of Mount Tambora, which began on April 5, 1815, devastated much of the...
Encyclopædia Britannica, Inc./Kenny Chmielewski and Christine McCabe
A volcano forms when magma beneath the Earth's crust forces its way to the surface....
© Merriam-Webster Inc.
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