EOSC 114 Study Guide - Midterm Guide: Subduction, Landslide, Lava
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4. list the different categories of volcanic rocks and explain the differences between the magmas they cooled from basalt: comes from mafic magma which contains less silica and is at high temperatures with low viscosity; non explosive andesite comes from intermediate magma, a mixture of both felsic and mafic dacite rhyolite: comes from felsic magma which contains higher contents of silica and has cooler temperates with high viscosity; explosive. Stratovolcanoes: mixed rock types, usually intermediate or felsic magma, it is interbedded lava flows, pyroclastic flows, lahars and is frequently explosive with viscous magma; it can erupt many times and stay active for 100,000 years calderas: felsic, explosive; created from large, explosive eruptions of felsic pyroclastic material, created when the roof of magma chamber collapses: describe the tectonic setting of southern bc (cascadia) and determine the dominant type of volcano that occurs here.
