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Introduction

A volcano is a location where magma, or hot melted rock from within a planet, reaches the surface. It may happen violently, in a massive supersonic explosion, or more quietly,as a sticky, slow lave flow.

Volcanoes have been a part of earth's history long before humans. Compare the history of human beings, a few million years in the making, to that of the Earth, over four billion years in the making.

Volumes of Some Well-Known Volcanic Eruptions 

       Eruption                      Date           Volume in km^3
       --------                      ----           --------------
       Paricutin, Mexico             1943                 1.3
       Mt. Vesuvius, Italy          79 A.D.                3
       Mount St. Helen, Washington   1980                  4
       Krakatoa, Indonesia           1883                 18
       Long Valley, California     pre-historic        >450 & <700
       Yellowstone, Wyoming        pre-historic           2400
Volcano Web Introduction

created by Rich Castellano [email protected]
Volcanic Studies, Big University

last modified: April 1, 1995

URL: http://www.big.edu/web/xxxxxxxx.html

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