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2026-09-29T11:51:41Z
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Some information on geology
2005-12-13T00:17:46Z
<p>70.186.153.103: </p>
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<div><h1>Volcanism</h1><br />
There are three(3) types of lavas formed by volcanoes. Mafic, Intermediate, and Felsic.<br><br />
<B><U>Mafic</B><U>(Basaltic)</U><br><br />
<li>%SiO2: < 50%</li><br />
<li>%FeMg: 4%</li><br />
<li>Temp: up to 1500C</li><br />
<li>Viscosity: Low</li><br />
<li>Eruptive Behavior: gentle</li><br />
<li>Distribution: divergent plate boundries, hot spots, convergent plate boundries</li><br />
<br />
<B><U>Intermediate</B><U>(Andesitic)</U><br><br />
<li>%SiO2: ~60%</li><br />
<li>%FeMg: ~3%</li><br />
<li>Temp: ~1000C</li><br />
<li>Viscosity: Intermediate</li><br />
<li>Eruptive Behavior: explosive</li><br />
<li>Distribution: convergent plate boundries</li><br />
<br />
<B><U>Felsic</B><U>(Rhyolitic)</U><br><br />
<li>%SiO2: >70%</li><br />
<li>%FeMg: 2%</li><br />
<li>Temp: 700C</li><br />
<li>Viscosity: High</li><br />
<li>Eruptive Behavior: explosive</li><br />
<li>Distribution: hot spots in continental crusts (Yellowstone National Park), convergent plate boundries </li></div>
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