12 plate tectonics notes
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12. Plate Tectonics
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Transcript of 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
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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