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Volcanoes

Mount Fuji, Japan. Volcanoes. * There are 2 (main) kinds of Volcanoes Steep sloped with violent (explosive) eruptions Gentle sloped with voluminous lava flows. Steep Sloped Violent/Explosive. Composite Cone, Stratovolcano

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Volcanoes

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  1. Mount Fuji, Japan Volcanoes * There are 2 (main) kinds of Volcanoes Steep sloped with violent (explosive) eruptions Gentle sloped with voluminous lava flows

  2. Steep Sloped Violent/Explosive • Composite Cone, Stratovolcano • Large, nearly symmetrical formed from layers of both lava and pyroclastic materials. Gas rich magma of andesitic composition, Dangerous, viscous lava flows, mostly located in the “Ring of Fire”. • Mt. Fuji, Mt. St. Helens • Cinder Cone • Composed of loose pyroclastic material and usually form from a single eruption. Short life and are usually smaller 30-300 meters. • Paricutin

  3. Gentle Sloped voluminous lava flows • Shield volcano – broad, slightly dome-shaped. Most have grown from the deep-ocean floor to form islands. Form from the accumulation of fluid basaltic lavas • Hawaiian islands, Kilauea, Iceland

  4. Factors that determine volcanic eruption type • Amount of dissolved gases in the magma • Temperature of the magma • Composition of the magma

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