Volcanism.

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Presentation transcript:

Volcanism

Volcanism Subduction

Juan de Fuca plate is subducting underneath the North American plate

Types of Volcanoes http://www.wwnorton.com/college/geo/egeo/animations/ch2.htm This website can show you animations of plate tectonics.

Types of Volcanoes Shield Produced by the accumulation of lava flows Very broad shaped…many kilometers wide Examples Hawaii, Olympus Mons

Types of Volcanoes Cinder Cones Steep-sloped volcanoes formed by the accumulation of pyroclastic material Once it erupts the magma in the vent solidifies Short-lived volcanoes

Types of volcanoes Composite Cone Formed from layers of lava and pyroclastic material Generate very explosive eruptions Examples include volcanoes of the Cascade range and the Ring of Fire

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