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I need specific answers on what happends during a volcano. something on the steps it takes.

2007-03-25 11:15:49 · 2 answers · asked by tohru 3 in Science & Mathematics Earth Sciences & Geology

2 answers

Volcanoes are generally found where tectonic plates pull apart or are coming together. A mid-oceanic ridge, like the Mid-Atlantic Ridge, has examples of volcanoes caused by "divergent tectonic plates" pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by "convergent tectonic plates" coming together.

http://en.wikipedia.org/wiki/Volcano

2007-03-26 00:02:54 · answer #1 · answered by capnemo 5 · 0 0

What happens during a volcanic eruption? Or , how is a volcano built?
There is a USGS publication by Robert Tilling that probably has what you need--quoted here..USGS pubs are not copyrighted: http://pubs.usgs.gov/gip/volc/intro.html
During an episode of activity, a volcano commonly displays a distinctive pattern of behavior. Some mild eruptions merely discharge steam and other gases, whereas other eruptions quietly extrude quantities of lava. The most spectacular eruptions consist of violent explosions that blast great clouds of gas-laden debris into the atmosphere.
Here's a link to a USGS site called "types of volcanic eruptions" that describes various types of eruptions. http://pubs.usgs.gov/gip/volc/eruptions.html
The site above has links to other chapters--such as this one describing the nature of volcanoes and what goes on inside--maybe this is what you need: http://pubs.usgs.gov/gip/volc/nature.html
Driven by buoyancy and gas pressure the molten rock, which is lighter than the surrounding solid rock forces its way upward and may ultimately break though zones of weaknesses in the Earth's crust. If so, an eruption begins, and the molten rock may pour from the vent as non-explosive lava flows, or if may shoot violently into the air as dense clouds of lava fragments. Larger fragments fall back around the vent, and accumulations of fall-back fragments may move downslope as ash flows under the force of gravity. Some of the finer ejected materiaIs may be carried by the wind only to fall to the ground many miles away. The finest ash particles may be injected miles into the atmosphere and carried many times around the world by stratospheric winds before settling out.

2007-03-25 19:20:49 · answer #2 · answered by luka d 5 · 0 0

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