The pressure under the earth is usually caused by tectonic plates which can come together or come apart, causing these fissures to appear. The magma pressure is from a heat source. It comes from natural radioactive decay within the Earth. T...
http://www.catalogs.com/info/earth-science/what-makes-a...
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Most volcanic materials erupt through the central vent. However, some magma may break through the main conduit wall and branch out into smaller channels and escape through vents formed in the sides of the volcano. Some eruptions occur on vo...
http://www.vtaide.com/png/George/volcanoes.htm
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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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The way volcanoes erupt usually takes a long time and this is how volcanoes erupt. First a volcano makes something called magma from melted rock. The magma goes through a circulation. It has to form at the bottom of the volcano and then start its way up the main vent.
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library.thinkquest.org/J0112524/how%20volcanoes%20erupt...
library.thinkquest.org/J0112524/how%20volcanoes%20erupt.htm
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"http://vulcan.wr.usgs.gov/Outreach/Abou… "The main reason for the eruptions from volcanoes is the heat deep within the Earth's mantle. This heat slowly melts rocks to create a slow moving substance called magma. Magma is lighter ...
http://answers.yahoo.com/question/index?qid=20080202131...
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it for a science project i have a kit already but ... it for a science project i have a kit already but the project is to see other way to make my volcano erupt. ... Arenal Volcano Eruption Arenal Volcano Eruption update, photos, Hotels viewing the... arenal.net...
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answers.yahoo.com/question/index?qid=20070423175806AA04...
answers.yahoo.com/question/index?qid=20070423175806AA04Dak
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There are several types of volcanoes and many different reasons for them to erupt. Volcanoes erupt due to pressure and density. Opening a shaken bottle of soda is a good demonstration of eruption. When a volcano erupts, magma rises and bubbles of dissolved gas release through the magma.
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merlin.alfred.edu/muller/FormerPhysWorld/PhysWorld/Proj...
merlin.alfred.edu/muller/FormerPhysWorld/PhysWorld/Project2/Volcanoes/volcanoes.html
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As part of our 4th grade curriculum, our social studies classes are learning about volcanoes. We wanted to know what makes a volcano erupt and if they are all found in the same places and if they are all the same.
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www.k12.hi.us/~kapunaha/student_projects/volc_blowout/v...
www.k12.hi.us/~kapunaha/student_projects/volc_blowout/volcano_main.htm
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How many times does a volcano erupt in a year? (Stephanie, Walden III Middle School, Racine, Wisconsin) ... Does a volcano erupt quickly, or does it erupt gradually? (Jenni Lunde, Walden III Elementary School, Racine, Wisconsin) ... What makes a volcano erupt? (Hannah Washington)
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www.sio.ucsd.edu/volcano/volcano_qa/general_ans.html
www.sio.ucsd.edu/volcano/volcano_qa/general_ans.html
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