Geological Hazards and Their Impact_McGeary_Date_032410

Geological Hazards and Their Impact_McGeary_Date_032410 -...

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Types of Volcanoes Shield Volcano - very gentle slops - basalt - doesn’t kill people Cinder Cone - basalt magma - meets water under the surface - freezes and boils (produces small explosion) - splatters out small pieces of frozen basalt - not too dangerous Strato - built up layers of ash and pyroclastic flows and lava - “classic” volcanoes - cone-shaped, steep-sided - Mt. Fuji, Mt. St. Helens, Mt. Vesuvius - very dangerous Lava Domes - small, very steep-sided, bulging - caused by very viscous magma
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Calderas - eruptions so large they destroy an entire mountain - formation: 1) early eruption closed 2) great pumice eruptions, with mountain beginning to founder 3) caldera resulting from collapse in mountain 4) crystallization Volcanoes: Hazards and Mitigation - affect relatively few people - can be really bad - however, volcanoes also do positive things Where do they occur? - U.S.: Oregon, Washington, California, Idaho, Nevada, Arizona, New Mexico,
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Geological Hazards and Their Impact_McGeary_Date_032410 -...

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