12 plate tectonics notes

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12. Plate Tectonics

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Mechanism of Plate Tectonics

• Material in asthenosphere heats and rises• When it cools it moves horizontally and sinks• This movement of material is called

convection cells

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=Gde4yIpj0ZL77M&tbnid=0XY7QeOuhnSO7M:&ved=0CAUQjRw&url=http://www.windows2universe.org/earth/interior/how_plates_move.html&ei=ftY6UuO3GNOs4AOSiIDQBQ&bvm=bv.52288139,d.eWU&psig=AFQjCNFTqOK5PEXjywmh6GbIzVUxgoLORQ&ust=1379674103192444

The Three Types of Plate Boundaries

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Divergent

-Rift Zone-Plates moving apart-Sea Floor created-Mid Ocean Ridges

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Convergent

-Subduction Zones-Plates moving toward each other-Seafloor destroyed-Creates trenches & Volcanic Island Arcs

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Transform

• Plates move past each other

• Faults are formed

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Example of Transform: San Andreas

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Ring of Fire• Around Pacific Ocean• Greatest quantity of earthquakes/volcanoes• Ring (outer edge of) Pacific Plate is full of faults

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