How a Volcano Erupts?

Answer

Thanks to the people that monitor volcano eruptions this way people are warned and they can evacuate but sometimes it happens when an inactive volcano erupts and everyone is caught by surprise. You can find more information here: http://www.topbits.com/how-a-volcano-erupts.html
1 Additional Answer
Volcano erupts when pressure on the magma chamber causes the magma to raise and come out. A volcano is an opening in the planet's crest, which allows the molten rock called magma to come out. Earth is made of tectonic plates and these plates fit together in a complex jig-saw manner. Due to movements of earth these plates crash each other and create pressure on magma. When the pressure exceeds a limit and the magma erupts from the vent created from the tectonic plate's crash.
Q&A Related to "How a Volcano Erupts?"
Making a volcano erupt is a great experiment. You can use a paper mache or dirt model volcano. You need to mix 2 spoons vinegar and 1 spoon dish washing liquid, place in small container
http://answers.ask.com/Science/Nature/how_to_make_...
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
http://www.ehow.com/how-does_4910765_what-causes-v...
Very broad question! Basically when a plate gets subducted under another the rock turns to molten rock and consequently becomes less dense. As the material is less dense it rises
http://www.quora.com/Why-do-volcanoes-erupt
The magma builds up pressure under the crust, it then rises to the surface to release the pressure and evetually overflows over the top.
http://wiki.answers.com/Q/Why+do+valcanoes+eruped
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