Friday, November 27, 2009

Lava Flows

*Remember, the difference between lava and magma: magma is inside the volcano and lava is outside!*

Here are the types of lava flows:
(all are dependent on gas content and viscosity and the more silica magma has, the higher viscosity it will have)

-Felsic Magma (Rhyolitic): 70% silica and has highest gas content, coolest magma, very explosive eruptions
-Mafic Magma (Basaltic): 50% silica, very little dissolved gas, hottest magma, non-explosive eruptions
-Intermediate (Andesitic): 60% silica, in between felsic and mafic in color, undissolved gas, explosive eruptions at lower temperatures

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