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volcano

The Columbia Encyclopedia, Sixth Edition
volcano vents or fissures in the earth's crust through which gases, molten rock, or lava , and solid fragments are discharged. Their study is called volcanology. The term volcano is commonly applied both to the vent and to the conical mountain (cone) built up around the vent by the erupted rock materials. Volcanoes are described as active, dormant, or extinct. The soil resulting from decomposition of volcanic materials is extremely fertile, and the ash itself is a good polishing and cleansing agent. Occurrence Volcanoes are found in association with midocean ridge systems (see ... Read more
Mayon Volcano
Britannica Concise Encyclopedia

[or Mount Mayon ] Active volcano, southeastern Luzon , Philippines. One of the world's most perfect volcanic cones, it has a base 80 mi (130 km) in circumference and rises to 7,943 ft (2,421 m). It is popular with climbers and campers and is the centre of Mayon Volcano National Park, which occupies ...

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volcano
World Encyclopedia

volcano Vent from which molten rock or lava , solid rock debris, and gases issue. Volcanoes may be of the central vent type, where the material erupts from a single pipe, or of the fissure type, where material is extruded along an extensive fracture. Volcanoes are usually classed as active, ...

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Sunset; 2/1/1988
Free Article Ready to rumble.(volcanoes)(Brief article)
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