- a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals.
- a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it.
Origin of volcano
Examples from the Web for volcanoes
Volcanoes spewed lava and ash, ocean floors were thrust upward, sand and rock and shale settled into slurry.Napa’s Earthquake Is Not The Only Thing Shaking The Vineyards
August 31, 2014
Other natural climate variations include solar activity and volcanoes.Earth Day: Discussing the Coming Climate Crisis With Heidi Cullen
April 22, 2012
Russian roulette,” as Scarth observes, “is not a game that volcanoes usually lose.The Best of Brit Lit
October 1, 2010
He saw her volcanoes, and the bright expanses that a gracious error has named seas.Howards End
E. M. Forster
Far beyond the pyramid the volcanoes are seen in their lonely grandeur.Aztec Land
Maturin M. Ballou
A very readable account of the phenomena of volcanoes and earthquakes.Nature.The Industries of Animals
Talking about Farquharson was second only to his delight in talking about volcanoes.
Such explosive eruptions are among the worst vices of volcanoes.The Mountain that was 'God'
John H. Williams
- an opening in the earth's crust from which molten lava, rock fragments, ashes, dust, and gases are ejected from below the earth's surface
- a mountain formed from volcanic material ejected from a vent in a central crater
Word Origin and History for volcanoes
1610s, from Italian vulcano "burning mountain," from Latin Vulcanus "Vulcan," Roman god of fire, also "fire, flames, volcano" (see Vulcan). The name was first applied to Mt. Etna by the Romans, who believed it was the forge of Vulcan.
- An opening in the Earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption.
- A usually cone-shaped mountain formed by the materials issuing from such an opening. Volcanoes are usually associated with plate boundaries but can also occur within the interior areas of a tectonic plate. Their shape is directly related to the type of magma that flows from them-the more viscous the magma, the steeper the sides of the volcano.♦ A volcano composed of gently sloping sheets of basaltic lava from successive volcanic eruptions is called a shield volcano. The lava flows associated with shield volcanos, such as Mauna Loa, on Hawaii, are very fluid.♦ A volcano composed of steep, alternating layers of lava and pyroclastic materials, including ash, is called a stratovolcano. Stratovolcanos are associated with relatively viscous lava and with explosive eruptions. They are the most common form of large continental volcanos. Mount Vesuvius, Mount Fuji, and Mount St. Helens are stratovolcanos. Also called composite volcano See more at hot spot island arc tectonic boundary volcanic arc.
A cone-shaped mountain or hill created by molten material that rises from the interior of the Earth to the surface.