12/19/15 1 World Map of Volcanoes Can you find the Ring of Fire? Types of Volcanoes Viscosity ØViscosity is the ability of a fluid to resist flow ØLow viscosity (runny) = Magma flows easier and gas escapes easier. So… lava just “leaks” out. ØHigh viscosity = magma does not want to move, or it is “sticky.” Gas is trapped for longer until eventually…BOOM, big volcano http://www.youtube.com/watch? v=xExdEXOaA9A
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Volcanoes and Earthquakesgharibess.weebly.com/.../6/13466856/volcanoes_notes... · Volcanoes Shield Volcano Kilauea, Hawaii Composite Volcano (Stratovolcano) Mt. St. Helens, Washington
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Transcript
12/19/15
1
World Map of Volcanoes
Can you find the Ring of Fire?
Types of Volcanoes
Viscosity
Ø Viscosity is the ability of a fluid to resist flow
Ø Low viscosity (runny) = Magma flows easier and gas escapes easier. So… lava just “leaks” out.
Ø High viscosity = magma does not want to move, or it is “sticky.” Gas is trapped for longer until eventually…BOOM, big volcano
http://www.youtube.com/watch?v=xExdEXOaA9A
12/19/15
2
Shield Volcano Ø Very Long Ø Gentle slopes Ø Basalt rock
(oceanic) Ø Non-explosive
(Lava oozes out or spurts)
Ø LOW Viscosity
Mt. Kilauea (Hawaii)
Composite Volcano (Stratovolcano)
Ø Circular bottom Ø Steep Sides Ø Explosive,
fragments plus lava. Ø More unpredictable Ø (Continental Rock) Ø HIGH Viscosity