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USGS Photograph taken on November 5, 1987, by Lyn Topinka. [medium size] [large size] [TIF Format, 24 M] Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma Because it is lighter ...
http://vulcan.wr.usgs.gov/Outreach/AboutVolcanoes/how_d...
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FEMA Disasters - Volcanoes ... ; USGS/Cascades Volcano Observatory, Vancouver, Washington ... Click button to link to the FEMA Website...
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vulcan.wr.usgs.gov/Hazards/Safety/
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Volcanoes are formed when there is a great stress inside the earth’s crust and the pressure of magma reaches so high that it finds its way upward causing an eruption. In the volcanoes which are not much active supply the magma from the dee...
http://www.letusfindout.com/how-do-volcano-erupt/
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A volcano erupts when pressure on the magma chamber causes the magma to rise and come out together with gas, rocks and ashes.
http://wiki.answers.com/Q/How_do_volcanoes_erupt
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The process of a volcano erupting begins with the generation of magma, which then migrates towards the surface until the pressure and temperature can equalize. Find out why sometimes there is...
http://www.ehow.com/articles_4140-p16-nature.html
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It may pour out in gentle streams called lava flows or erupt violently into the air. Rocks ripped loose from the inside of the volcano or torn apart by the gas may be shot into the air with the lava. These rocks blown out of a volcano are called pyroclastic rocks.
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library.thinkquest.org/17457/volcanoes/erupt.php
library.thinkquest.org/17457/volcanoes/erupt.php
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Make a volcano erupt ... Pompeii: The Last Day ... Explore a Virtual Volcano...
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dsc.discovery.com/convergence/pompeii/interactive/inter...
dsc.discovery.com/convergence/pompeii/interactive/interactive.html
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A volcano may refer to ; ... a vent or opening in the surface of the Earth through which lava, hot gases, ash and rock fragments erupt OR; ... A volcano begins as melted rock (magma) which rises from deep inside the earth toward the surface. As the gas-filled magma rises, it melts gaps in the surrounding rock and forms a...
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www.vtaide.com/png/George/volcanoes.htm
www.vtaide.com/png/George/volcanoes.htm
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kids.discovery.com/games/pompeii/pompeii.html
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