EOSC 114 Study Guide - Final Guide: Continental Crust, Magma Chamber, Volcanic Arc
15 Apr 2013
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Document Summary
Pliny wrote a letter describing the eruption and death of his uncle, who was saving people. Hazard = size, frequency, type of damage. Vulnerability = what is impacted and value. Mitigation = $ invested t reduce vulnerability or to control hazard. Melted rock in the earth, below earth surface. Created by the melting of pre-existing rock in earth"s interior (mantle & crust) It reaches the surface through fractures an erupts as lava or as pyroclastic material. Melted rock exposed at the earth"s surface. From bottom to top: source region. Mantle (peridotite) into magma (basaltic -> granitic) Magma is less dense: transport region. Magma channels, moving along cracks in the earth"s crust. Sills horizontal intrusion of magma: storage region. Magma ponds below the surface in large chambers. Magma freezes in crust, is not erupted. Large crystals from magma cooling down slowly.
