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Volcanoes

Plate boundaries, movement, features, world examples
by

Chad Sindaco

on 7 January 2016

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Transcript of Volcanoes

http://www.britannica.com/EBchecked/topic-art/632130/3266/Volcanic-activity-and-the-Earths-tectonic-plates-Stratovolcanoes-tend-to
Volcanoes
Subduction
Zone
Rift Zone
Hot Spot
An opening or area of Earth's surface through
which magma and gases
are released
Cool Link ... click below
Shield Cones
Composite Cones
Cinder Cones
http://www.wwnorton.com/college/geo/egeo2/content/animations/2_6.htm
animation: click below
Layers
Non explosive
Thin lava (mafic)
Gentle slope
Can be tall
Form over hot spots and rift zones
Stratovolcanoes
Form at subduction zones
Most common cone
Alternating layers
Pyroclastic solids
Lava Flows
Thicker magma (felsic)
Broad base, Steep sides
Can be VERY explosive
(after long periods of nonexplosive eruptions)
Small, steep
Piles of pyroclastic solids
Erupt for short periods
Thick magma (felsic)
Usually form along subduction zones
Media
Volcanoes
Skjaldbreiður = broad shield
North Am. Plate
Eurasian Plate
Rift Valley
Iceland
Skjaldbreiður
(broad shield)
Mt. St. Helens
Rebuilding!
Full transcript