Extrusive - Wikipedia, the free encyclopedia
Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fal...
en.wikipedia.org/wiki/Extrusive
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Extrusive igneous rocks, or volcanics, form when magma makes its way to Earth's surface. The molten rock erupts or flows above the surface as lava, and then cools forming rock. The lava comes from the upper mantle layer, between 50 km and 150 km below the Earth's surface.
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www.windows.ucar.edu/tour/link=/earth/geology/ig_extrus...
www.windows.ucar.edu/tour/link=/earth/geology/ig_extrusive.html
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Igneous rock - Wikipedia, the free encyclopedia
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Igneous rock (from the Latin ignis meaning fire ) is one of the three main rock types (the others being sedimentary and metamorphic rock). Igneous rock is formed by magma (molten rock) being cool...
en.wikipedia.org/wiki/Igneous_rock
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The crystals that form do not have time to grow very large, so most extrusive rocks are finely grained. The term includes fine-grained crystalline or glassy rocks formed from hot lava quenched at or near Earth's surface, and those made of welded fragments of ash and glass ejected into the air during a volcanic eruption.
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www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0...
www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0035062.html
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Extrusive igneous rocks show up as volcanos. Intrusives exist as bodies of igneous rock below ground, such as batholiths, dikes, and sills. ... Many excellent web pages exist on volcanoes, but as with many things on the web the problem is not finding information, it is sorting through the avalanche of information that...
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csmres.jmu.edu/geollab/Fichter/IgnRx/Weblink.html
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GLENDALE COMMUNITY COLLEGE ... EARTH SCIENCE IMAGE ARCHIVE ... ASTRONOMY GEOLOGY METEOROLOGY MUSEUM TOUR PHS 120 PHS 120 ONLINE HOME...
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www.gc.maricopa.edu/earthsci/imagearchive/extrusive.htm
www.gc.maricopa.edu/earthsci/imagearchive/extrusive.htm
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Extrusive: Igneous rocks which cool at the surface of the earth. Commonly exhibit fine grained textures.
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www.edzone.net/~tzielask/extrusive.htm
www.edzone.net/~tzielask/extrusive.htm
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or extrusive igneous rocks form when the magma cools and crystallizes on the surface of the Earth ; ... If magma makes it to the surface it will erupt and later crystallize to form an extrusive or volcanic rock. If it crystallizes before it reaches the surface it will form an igneous rock at depth called a plutonic...
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www.tulane.edu/~sanelson/geol111/igneous.htm
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back to Volcano page ... THE MOVEMENT OF LAVA AT THE EARTH'S SURFACE IS USUALLY REFERRED TO AS VOLCANIC ACTIVITY. ... This often, but not always, results in the formation of volcanoes, which are more or less cone shaped mountains. Volcanic eruptions create varied land forms depending on the number of factors that can...
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hrsbstaff.ednet.ns.ca/mcallip/Volcanoes/extrusive_volca...
hrsbstaff.ednet.ns.ca/mcallip/Volcanoes/extrusive_volcanism.htm
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[ĭk-strōṓsĭv, -zĭv]
