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Transcript of Volcanoes
An opening or area of Earth's surface through
which magma and gases
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Thin lava from asthenosphere (mafic)
Can be tall
Form over hot spots and rift zones
Form at subduction zones
Most common cone
Thicker magma from lithosphere (felsic)
Broad base, Steep sides
Can be VERY explosive
(after long periods of nonexplosive eruptions)
Piles of pyroclastic solids
Erupt for short periods
Thick magma from lithosphere (felsic)
Usually form along subduction zones, but can form along rift zones and hot spots
Skjaldbreiður = broad shield
North Am. Plate
Mt. St. Helens