Offers a look at the structure, characteristics, and morphology of volcanoes with an examination of why they erupt along with an overview of the environmental benefits and detriments they cause. Original.

Product Description: Hot magma rising through the Earth's crust releases gases that expand and may come into contact with external water that vaporizes. The magma is then fragmented into an accelerating gas-particle/droplet mixture that is shot into the atmosphere, possibly in an overpressured state, where it may buoyantly rise up into the stratosphere as an ash plume, partially or totally collapse back to the surface, or rapidly expand sideways, or undergo a combination of these processes...read more