How a Volcano Works Whenever there is a major volcanic eruption in the world, you'll see a slew of newspaper articles and nightly news stories covering.

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How a Volcano Works Whenever there is a major volcanic eruption in the world, you'll see a slew of newspaper articles and nightly news stories covering the catastrophe, all stressing a familiar set of words: violent, raging, awesome….. But what is it that actually causes an eruption? Magma rises through cracks or weaknesses in the Earth's crust. Pressure builds up inside the Earth. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. The lava from the eruption cools to form new crust. Over time, after several eruptions, the rock builds up and a volcano forms. Click here for more info