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Volcanoes (Mount St. Helens (Erupted May 18. 1980, Coughing Mountain,…
Volcanoes
Mount St. Helens
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April 1st=plumes of steam and ash 200,000 feet in the air
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Volcanoes Eruption
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Quiet
aa
slow moving, high viscosity
Pahoehoe
Fast moving, low viscosity
Explosive
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ash, rock, pyroclastic flows
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Types Of Volcanoes
Shield Volcanoes
common along divergent plate boundaries and oceanic hot spots. Large with gentle slopes of basaltic lavas
Composite Volcanoes
Large steep sided volcanoes that result from explosive eruptions of andesitic and rhyolitic lava and ash along convergent plate
Cinder Cone
Small, steep sided volcanoes that erupt gas-rich, basaltic lavas
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Myths
Pompeii
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Eruption August 24, 79 A.D.
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