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TeachMeFinance.com - explain Basalt Basalt The term 'Basalt' as it applies to the area of volcanos can be defined as ' Basalt is a hard, black volcanic rock with less than about 52 weight percent silica (SiO2). Because of basalt's low silica content, it has a low viscosity (resistance to flow). Therefore, basaltic lava can flow quickly and easily move >20 kilometers from a vent. The low viscosity typically allows volcanic gases to escape without generating enormous eruption columns. Basaltic lava fountains and fissure eruptions, however, still form explosive fountains hundreds of meters tall. Common minerals in basalt include olivine, pyroxene, and plagioclase. Basalt is erupted at temperatures between 1100 to 1250° C. '. The term 'Basalt' as it applies to the area of reclamation can be defined as ' Fine-grained, dark-colored volcanic rock rich in iron-bearing minerals'. Previous 5 Terms: Barrows and gilts Bartel's Rotation Number Barter basal area (of a tree) basal sliding (basal slip) Next 5 Terms: Base base Base (cushion) gas Base (or contract) acreage Base bill About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.