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volcano
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Mount St. Helens volcano
How volcanoes work, explained by a volcanologist
Mount Fuji, Japan. volcanism and plate tectonics volcanoes and thermal fields
What it's like to visit an active volcano
seismic sensor pahoehoe Mount St. Helens eruption.
Types of volcanic eruptions explained
For Students
volcano summary
Quizzes
Taj Mahal, Agra, India. UNESCO World Heritage Site (minarets; Muslim, architecture; Islamic architecture; marble; mausoleum)
Wonders of the World Quiz
Hawaiian volcanic crater, Hawaii
Volcanoes Quiz
Read Next
Ash cloud rising from the Kilauea Volcano Pu`u `O `o as crater floor collapses due to magma withdrawal. Incandescent rubble can be seen crumbling and rolling down the scarp. East rim of Pu`u `O `o is in the foreground, Kilauea, Hawaii on March 6, 2011.
Watch Your Step: 6 Things You Can Fall Into
Mount Saint Helens (Cascade Range, southwestern Washington) spewing ash during the 1980 eruption.; Mount St. Helens
35th Anniversary of Mount Saint Helens Eruption
animated gif/infographic of the Mount Tambora eruption, April 1815. volcano. Indonesia.
How the 1815 Eruption of Mount Tambora Produced the “Year Without a Summer”
Arenal Volcano in northwestern Costa Rica in the province of Alajuela.
Are Volcanoes Dangerous When They’re Not Erupting?
animated gif/infographic of the Mount Tambora eruption, April 1815. volcano. Indonesia.
Mount Tambora 200 Years Later
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Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics
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Close-up of ostriches (Struthio camelus) necks and heads; location unknown.
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Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
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Panama Canal infographic
Timeline and Map of the Panama Canal
Watergate scandal. Richard M. Nixon. President Nixon gives a press conference and talks to the press, March 12, 1971.
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Mount St. Helens volcano
Mount St. Helens volcano Mount St. Helens volcano, viewed from the south during its eruption on May 18, 1980.

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Written by
Barbara B. Decker
Writer. Coauthor of Volcanoes.
Barbara B. Decker,
Robert W. Decker
Professor Emeritus, Dartmouth College, Hanover, New Hampshire. Coauthor of Volcanoes.
Robert W. Decker•All
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Last Updated: • Article History

volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. A volcanic eruption is an awesome display of Earth’s power. Yet, while eruptions are spectacular to watch, they can cause disastrous loss of life and property, especially in densely populated regions of the world. Sometimes beginning with an accumulation of gas-rich magma (molten underground rock) in reservoirs near Earth’s surface, they can be preceded by emissions of steam and gas from small vents in the ground. Swarms of small earthquakes, which may be caused by ...(100 of 12070 words)

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