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Volcanoes (VOLCANIC ERUPTIONS (volcanic ash: tiny particle of pulverized…
Volcanoes
VOLCANIC ERUPTIONS
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dissolved gases in magma consist of water vapor, carbon dioxide, and sulfur dioxide
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pyroclastic flows are avalanches of hot gas, ash, and rock that move very fast and are super hot
volcanic eruptions can be predicted by by ground deformation, shape change in the volcano, and a series of earthquakes called earthquake swarm
Mount St. Helens
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April 1 - steam and ash 200,000 feet in the air
5.1 earthquake, landslide at 300 mph, ash 15 miles in the air, lateral eruption 20 miles, blew ash east over U.S., VEI 5
57 deaths (3 in red zone), thousands of animals, 200 homes destroyed, 185 miles of road, 15 miles of railway
WHERE DO VOLCANOES FORM?
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a hazard assessment program that monitors earthquake activity, changes in the shape of a volcano, gas emissions, and the past eruptive history of a volcano
TYPES OF VOLCANOES
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shield volcanoes: common along divergent plate boundaries and oceanic hot spots and are large with gently slopes of basaltic lava
composite volcanoes: large, steep-sided volcanoes that result form explosive eruptions of andesitic and rhyolitic lave and sash along convergent plate boundaries
cinder cones: small, steep-sided volcanoes that erupt gas-rich, basaltic lavas
WHAT IS A VOLCANO?
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volcanic eruptions are constantly forming Earth's surface by making large mountains and creating new crust
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LEGENDS AROUND VOLCANOES
Pompeii
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erupted August 24, 79 A.D.
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