How do volcanoes form

Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, then volcanoes erupt. Extremely high temperature and pressure cause the rock to melt and become liquid rock which we usually refer to as "magma". When a large body of magma has formed, it rises through the denser rock layers toward Earth's surface.  Magma that has reached the surface is called "lava".

  • Subject : Science
  • Topic : Earth / Environmental
  • Posted By : Jason
  • Created on : 06-07-2012

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