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Physical Geology

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Volcanoes and Igneous Rocks

Magma: Molten material consisting of liquid, gas, and a few xls.

1) Basaltic magma: 50% SiO2

tends to be highly fluid, low viscocity

2) Granitic magma: 65-77% SiO2

Magma which reaches the surface and erupts from a volcano is termed extrusive, such as lavas and ash clouds. That which xlizes underground is called intrusive or plutonic.

Crystallization:

Bowen's Reaction Series:

VOLCANOES

Basaltic eruptions:

Silicic eruptions:

Igneous Rocks

Distribution of igneous activity:


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