volcanic conduit

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• Volcanic neck — Vol*can ic neck (Geol.) A column of igneous rock formed by congelation of lava in the conduit of a volcano and later exposed by the removal of surrounding rocks. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

• volcanic neck — noun : a column of igneous rock that is formed by congelation of lava or the consolidation of volcanic breccia in the conduit of a volcano and that may later be left standing above the adjacent country by the removal of surrounding rocks by… …   Useful english dictionary

• conduit — GLOSSARY OF VOLCANIC TERMS The underground passage or passages through which magma makes it way to the earth s surface …   Glossary of volcanic terms

• Types of volcanic eruptions — In this article types of eruption will be used to refer to the mechanism causing the eruption. The style of eruption will be used to describe subcategories of eruption, which have the same eruptive mechanism. For example strombolian and vulcanian …   Wikipedia

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• Lassen Volcanic National Park — IUCN Category II (National Park) …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Eldfell — is a cinder cone volcano just over 200 metres (650 ft) high on the Icelandic island of Heimaey. It formed in a volcanic eruption which began without warning just outside the town of Heimaey on 23 January 1973. Its name means Mountain of Fire in… …   Wikipedia

• Pyroclastic rock — Pyroclastic rocks or pyroclastics (derived from the Greek πῦρ , meaning fire, and κλαστός , meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked… …   Wikipedia

• Australia — /aw strayl yeuh/, n. 1. a continent SE of Asia, between the Indian and the Pacific oceans. 18,438,824; 2,948,366 sq. mi. (7,636,270 sq. km). 2. Commonwealth of, a member of the Commonwealth of Nations, consisting of the federated states and… …   Universalium