EESB18H3 Lecture Notes - Portuguese Bend, Flush Toilet, Slope Stability
22 Jan 2013
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Document Summary
Consider a dangerous volcano such as vesuvius, near napoli, or mt. The most famous caldera in n. america is yellowstone: allowed the mapping of the eruptions in geological history. Its history is recorded in extensive ash deposits which cover over half of the us. Mantle = orange part continental crust residing on top. Magma starting to come up thru mantle lower density magma that rises up. High gas content and high water vapor content, really hot, really runny find weakness in rock, fractures and finds its way up. Magma rises b/c it"s density is lesser than the mantle density will come out of rock. If for instance some felsic magma does happen to find it"s way up to the surface stratovolcano (composite volcano) Hazards: lava flows, ash falls, famine, tsunami, gas emission. Benefits: soil fertility, hot springs and geothermal power. People in hawaii have to deal with troublesome lava flows, but the flow is seldom life- threatening.
