PUBHLTH 90 Lecture Notes - Lecture 3: Mount St. Helens, Magma Chamber, Convergent Boundary
6 Oct 2016
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Document Summary
Acres of trees downed by lateral blast. Ash clouds penetrated us, creating ash faults. Every business shut down magma chamber - underlying volcano and supplying fuel; large underground reservoir of magma. Magma works its way through up the volcano and goes through central vent. If magma comes out on the surface of the earth, it comes out as lava and can generate a lava flow. Magma can also come out of a side fissure and can also form a lava flow. When a rock cools out of the lava on the surface of the lava, called volcanic rock. 3 v"s - determine the type of volcano and eruption u get determine how explosive it is the higher the v, the more explosive and dangerous the eruption will be. Volume viscosity - resistance fluid has to pouring. Higher viscosity lava forms narrower taller cones. Less sio2, less viscous as magma moves upward, gas bubbles come out of solution, pressure decreases.
