What Makes a Volcano Erupt?

Answer

When pressurized molten rock combines with heated gases, volcanoes erupt. The magma being less dense than the solid rock surrounding it produces eruption. You can find more information here: http://www.umich.edu/˜gs265/society/volcanoes.htm
Q&A Related to "What Makes a Volcano Erupt?"
the volcano erupts from the earth. when it hits 200 degrees celsius, it will erupt..and volcanoes can erupt ice at -300 degrees celsius
http://wiki.answers.com/Q/What+gas+makes+the+volca...
1. Wash and rinse a 20 oz. plastic bottle. Remove any label. Dry the outside of the bottle completely. 2. Wrap masking tape around the bottle with the sticky side of the tape facing
http://www.ehow.com/how_8408112_make-eruptible-vol...
"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
http://answers.yahoo.com/question/index?qid=200802...
The pressure of the magma (molten rock) building up under the earth's surface
http://wiki.answers.com/Q/What_causes_an_volcano_t...
1 Additional Answer
Ask.com Answer for: what makes a volcano erupt
Several factors trigger volcanic eruptions, including the buoyancy of magma, a build-up of pressure from the gases in the magma and an injection of new magma into a full magma chamber.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.
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