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Volcanoes (Mount St. Helens (Erupted may 18, 1980, Indians names it…
Volcanoes
Mount St. Helens
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1792- british named mt, st, hellen
march 16, 100 earthquake a week
March 24, 20 earthquakes an hour
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April 1, 200000 feet in the air water
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April 29 Closed area, Evicted from red zone
May 7- may 17, Small eruptions, north side bulged (evidence that magma coming)
May 18, 5.a earthquakes, Northern bouldge slid away went about 300 mph, Ash raised 15 miles in the air
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Volcanic Eruptions
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Volcanic eruptions can be predicted by the ground deformation, shape change in the volcano, and a series of earthquakes called earthquakes swarm
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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
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Gases- Water vapor, Carbon Dioxide, sulfur oxide
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Lava flow- slow, not usually deadly, can damage or destroy communities/ land near volcano
Ash fall- very small pieces of rock/glass, Affect air quality, disrupt air travel, large quantities can affect climate, 28 miles high/over 600 miles away/ 5-7 feet
mudflow- like a flood but with mud and ash in it,
Pyroclastic flow- fast moving avalanche of hot gas, ash, and rock--- can be 1800 degrees and go up to 400 mph
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Fire- MAterial so hot, it causes fire- burning gas (sulfur dexide)
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Parts of the volcanoes
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Lava flow is the lava that goes down the side of the volcano and it is usually called aa and the lighter one is called poe poe
Where do Volcano Form?
A hazard assessment program that monitors earthquakes activities, changes in the shape of a volcano, gas emissions, and the past eruptive history of a volcano
60 potentially active volcanoes in the U.S.-- mostly in Alaska, Hawaii, Washington, Oregon, and California
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types of Volcanoes
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Composite volcanoes- Are large, steep- side volcanoes that result from explosive eruptions of andesitic and rhyolitic lava and ash along convergent plate boundaries
Cinder cones- Are small, steep- sided volcanoes that erupt gas-rich, basaltic lavas (single vent)
Super-volcano- lots of pressure, large, often mistaken for multiple volcanoes
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How do Volcano form?
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3 types of lava- Pahoehoe- smooth shiny surface, usually dark colored -- Aa- Rough surface, brown- reddish color-- Pillow lava- Submarine eruptions
What is a Volcano
Volcanic eruptions are constantly forming Earths surface by making large mountains and creating new crust
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Legends
Pompee
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Advance- complex water system, amphitheater
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Mount Vesuvius erupted in Augest 24, 79 A.D.
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