Geography 2240A/B Lecture : Chapter+7+Volcanos+-+The+Basics0.pdf
8 Feb 2013
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The second process we study that results from earth s internal energy is volcanic eruption. Dormant or extinct volcanoes look great (fig. 1; mt. Also, of course, the slopes of extinct volcanoes are used in many parts of the world for recreational enjoyment such as down-hill skiing. But, of course, what we re in this course to consider is not the good but the very bad! Volcanoes are testament to earth s huge internal energy, and the release of that energy can be catastrophic. Imagine a volcanic eruption in which an area the size of greater new. Imagine that so much ash and gas is blown up into the atmosphere that sun s light is dimmed to the point that there s no summer for two years. It happened at least three times in the western usa when a huge volcano erupted at yellowstone national park.
