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?"
A volcano erupts when the magma in the Earth's mantle builds up enough pressure that it cracks the crust and bursts through the opening. Once the magma starts coming out of a volcano
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As far as i know, I believe that the plate of earth underneath that's spitting out the lava has a little time limit going over it. Any volcano can erupt from a couple seconds to maybe
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The volcano science project is a classic that has been recreated each generation. The student typically builds a papier mâché model of a volcanic mountain. The student
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No one know if there are active volcanoes on Venus. There are old ones. There is no evidence of plate motion on Venus.
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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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