what is a volcano
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- A volcano is a vent or chimney which transfers molten rock known as magma from depth to the Earth's surface.Magma erupting from a volcano is called lava and is the material which builds up the cone surrounding the vent. A volcano is active if it is erupting lava, releasing gas or generates seismic activity.A volcano is dormant if it has not erupted for a long time but could erupt again in the future. Once a volcano has been dormant for more than 10 000 years, it is termed extinct. volcano is active if it is erupting lava, releasing gas or generates seismic activity. A volcano is dormant if it has not erupted for a long time but could erupt again in the future. Once a volcano has been dormant for more than 10 000 years, it is termed extinct.
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- A volcano is an opening in the Earth’s crust from which magma (hot molten rock), ash and gases escape. Volcanic eruptions are driven, in part, by pressure from dissolved gas, much as escaping gases force the cork out of a bottle of champagne.When magma erupts, it is called lava. The type of volcano that forms depends on whether the lava is viscous (thick and sticky) or runny, and on how much gas it contains.If lava is runny, gases escape easily. A runny lava with lots of gas forms fire-fountains that spew into the air and break into globs that solidify as they fall to the ground.olcanic eruptions are driven, in part, by pressure from dissolved gas, much as escaping gases force the cork out of a bottle of champagne. When magma erupts, it is called lava. The type of volcano that forms depends on whether the lava is viscous (thick and sticky) or runny, and on how much gas it contains.
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- A volcano is an opening in Earth’s crust. When a volcano erupts, hot gases and melted rock from deep within Earth find their way up to the surface. This material may flow slowly out of a fissure, or crack, in the ground, or it may explode suddenly into the air. Volcanic eruptions may be very destructive.
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Volcano 508 pages on this wiki. A Volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.An erupting volcano.ivergent plate boundaries Edit. At the mid-oceanic ridges, two tectonic plates diverge from one another. New oceanic crust is being formed by hot molten rock slowly cooling down and solidifying. In these places, the crust is very thin and eruptions occur frequently because of the pull by the tectonic plates.
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Volcano Facts and Types of Volcanoes A volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form:
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- A volcanic eruption is the release of molten rock and volcanic gases through Earth 's crust to the surface. Molten rock within the earth, or magma, is driven to erupt by buoyancy because it is lighter than the surrounding rock. Dissolved gases within the magma are under great pressure and force magma upwards.olcanoes are vents or fissures in Earth 's crust through which lava, gases, and pyroclastic debris are released. More commonly, the term volcano refers to the landform built up from the accumulation of lava and/or pyroclastic debris.
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- Full Definition of VOLCANO. 1. : a vent in the crust of the earth or another planet or a moon from which usually molten or hot rock and steam issue; also: a hill or mountain composed wholly or in part of the ejected material.2. : something of explosively violent potential.See volcano defined for English-language learners.. : a vent in the crust of the earth or another planet or a moon from which usually molten or hot rock and steam issue; also: a hill or mountain composed wholly or in part of the ejected material. 2. : something of explosively violent potential.
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- volcano - Student Encyclopedia (Ages 11 and up) A volcano is a vent, or opening, in Earth’s surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
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- Title Slide. Slide 2. A volcano is a place on the Earth’s surface where hot, molten rock (called magma) breaks through. As we will see there are many different types of volcanoes and material that is erupted. volcanic eruption dominated by the passive outpouring of lava onto the Earth’s surface is called an effusive eruption. This happens either because there is not enough gas (volatiles) in the magma to break it apart upon escaping, or the magma is too viscous (sticky) to allow the volatiles to escape quickly.
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Volcano A volcano is a rupture on the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle. volcano is a rupture on the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
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- Volcanoes. Volcanoes are vents, fissures or openings in the Earth's crust from which hot ashes, gases and magma erupt. On land, volcanoes usually take the form of mountains or hills with one or more volcanic vents.But the vast majority of the world's volcanoes lie beneath the sea along the global oceanic ridges.olcanoes are vents, fissures or openings in the Earth's crust from which hot ashes, gases and magma erupt.
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Volcano, Hawaii Volcano, Hawaii. From Wikipedia, the free encyclopedia. Volcano is a census-designated place (CDP) in Hawaii County, Hawaii, United States located in the District of Puna with a small portion of the CDP in the District of Kaʻū. The population was 2,575 at the 2010 census.
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- A volcano is formed by eruptions of lava and ash. Volcanoes are usually cone shaped mountains or hills. When magma [magma: Magma is molten rock.] reaches the Earth's surface it is called lava. When the lava cools, it forms rock.
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- A volcano is simply a vent at the surface of the earth through which lava and other volcanic materials are ejected from the Earth s interior. Lava is the term used for magma that has reached the surface because of a volcanic eruption.Magma is the molten material below the Earth's surface.t. Shasta is a stratovolcano or Composite Volcano. Composite volcanoes are the most beautiful - - - and ! - - - the most deadly of the volcano types, at least in Holocene time. Their lovely steep-sided, symmetrical cone shapes are built up by eruptions of intermediate viscosity andesitic lava and explosive tephra.
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- A volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form:Earth's crust is 40 to 250 miles (64 to 402 kilometers) thick.It is broken up into 14 major and 38 smaller pieces called tectonic plates. volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form:
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volcano 1. An opening in the Earth's crust from which lava, ash, and hot gases flow or are thrown out during an eruption. 2. A usually cone-shaped mountain formed by the materials that flowed or were thrown out from such an opening.
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Volcano A volcano is a rupture on the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle. volcano is a rupture on the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle.
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Volcanoes Click on the globe to find out where in. Etna is located. Geologists consider. to be a strato volcano. A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments.
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Volcano Facts and Types of Volcanoes A volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products.Let's take a look at how volcanoes form: Earth's crust is 40 to 250 miles (64 to 402 kilometers) thick.It is broken up into 14 major and 38 smaller pieces called tectonic plates. volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form: Earth's crust is 40 to 250 miles (64 to 402 kilometers) thick.
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Volcano A volcano is a rupture on the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle.hey are the most dangerous type of volcano. Examples include: Yellowstone Caldera in Yellowstone National Park and Valles Caldera in New Mexico (both western United States); Lake Taupo in New Zealand; Lake Toba in Sumatra, Indonesia; and Ngorongoro Crater in Tanzania.
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Volcano A volcano is a vent, or opening, in Earth’s surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
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volcano 1. a. An opening in the earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption. b. A similar opening on the surface of another celestial object. 2. A usually cone-shaped mountain formed from the materials issuing from such an opening.oun. 1. volcano-a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt. vent. crack, scissure, cleft, crevice, fissure-a long narrow opening. eructation, extravasation, eruption - (of volcanos) pouring out fumes or lava (or a deposit so formed).
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How do volcanoes create islands? A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.
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Glossary of Geography Terms and Definitions A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt. volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.
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Volcano A volcano is a vent or 'chimney' that connects molten rock (magma) to the Earth's surface. It includes the surrounding cone of built-up material. Magma erupting from a volcano is called lava.Gases and pieces of rock erupt from volcanoes too. volcano is a vent or 'chimney' that connects molten rock (magma) to the Earth's surface. It includes the surrounding cone of built-up material. Magma erupting from a volcano is called lava.
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Glossary of Geography Terms and Definitions A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.n simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.