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Volcanoes
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Volcano Opening in the Earth’s crust where magma is released as lava.
Have three types of flow: lava, gaseous & mud
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Volcano Found at subduction zones, divergent boundaries, and over hot spots.
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Impacts to Earth Volcanic ash can block out the sunlight for days, even weeks Ash will blanket land
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Impacts to Earth Extreme heated gases can kill anything in its path
Causes numerous fires and property damage.
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Volcano Cinder Cone explosive eruptions steep sided mountain
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Volcano Shield Volcano quiet eruptions of basaltic lava in flat layers
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Volcano Composite Volcano
alternating eruptions of explosive rock, gas and ash and lava flows
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Volcano Continental volcanoes – form at ocean to continent boundaries
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Volcano Island arc volcano – form at ocean to ocean boundaries
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Volcano Hot spot volcano – form at weak spots in the earth’s crust
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2 Types of Magma Basaltic magma Granitic magma Made of basalt
Low silica content therefore “runny” (not viscous) – like syrup Granitic magma Made of granite High silica content therefore “thick” (viscous) – like honey/molasses
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