EARTHSC 1121- Midterm Exam Guide - Comprehensive Notes for the exam ( 19 pages long!)
11 Oct 2017
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Document Summary
Volcanic eruptions cause great harm to humans: eruptions have profoundly influenced human history, in the past 2000 years: an estimated 250,000 deaths. Many populated areas ring active volcanoes: more humans live in volcano hazard areas than ever. Understanding volcanic behavior is the best defense. Volcanoes have characteristic features: magma chamber, fissures and vents, craters, calderas, distinctive profile. Located in the upper crust: usually an open cavity or area of high fractured rock, contains a large quantity of magma. Some magma cools here to form intrusive rock. Some magma rises via a conduit to the surface. Magma may also erupt along a linear tear, a fissure: fissure eruptions man display a curtain of fire . A vent is a lava outlet on a volcano. Vents can form anywhere on the volcano: summit vent located at the top of the volcano, flank vent - locate on the side of a volcano. Lava lakes can form around the vent.
