Volcanoes * There are 2 (main) kinds of Volcanoes 1.Steep sloped with violent (explosive) eruptions...
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Transcript of Volcanoes * There are 2 (main) kinds of Volcanoes 1.Steep sloped with violent (explosive) eruptions...
Volcanoes
* There are 2 (main) kinds of Volcanoes
1.Steep sloped with violent (explosive) eruptions2.Gentle sloped with
voluminous lava flows
Mount Fuji, Japan
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
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
Factors that determine volcanic eruption type
a. Amount of dissolved gases in the magma
b. Temperature of the magma
c. Composition of the magma