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Asked by issi759 to Alessandro, Angela, Claudia, Marina, Phil on 12 Mar 2013.
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Marina De Vos answered on 12 Mar 2013:
When the rock inside the earth melts it becomes magma. Being lighter than rock, the magma rises creating pressure. Eventually to magma creeps through cracks and vents. This is when a volcano erupts. A volcano is active when magma underneath is created/present.
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Comments
nicenadia commented on :
volcanoes are not a living thing
galileogalilei commented on :
When the magma is able to penetrate the plates to the surface, you get a volcano eruption. This happens where two plates collide or where they are thinner.
The magma is then called lava. When the lava gets hard, it forms rock and that’s how the mountain around volcanoes forms.