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Volcano

A volcano is a geologic structure formed where magma comes close to the surface of a planet. This tends to occur at the boundaries of the continental plates. This magma can break the surface and flow as lava (rare), can cause rocks above it to melt and flow as lava, or its presence can cause the ejection of cinders[?], volcanic glass, steam, volcanic ash and gases of various temperatures.

The study of volcanos is called volcanology (or vulcanology in some spellings).

Formation

Public domain picture from NASA of Tambora, Indonesia.

See also: Prehistoric volcano[?], List of volcanoes, Pacific Ring of Fire

External link and reference

Volcanoes by Cliff Ollier, Published by Basil Blackwell, Oxford, UK, 1988, ISBN 0-631-15664-X (hardback), ISBN 0-631-15977-0 (paperback).

 

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