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12. Plate Tectonics
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
The Three Types of Plate Boundaries
Divergent
-Rift Zone
-Plates moving apart
-Sea Floor created
-Mid Ocean Ridges
Convergent
-Subduction Zones
-Plates moving toward
each other
-Seafloor destroyed
-Creates trenches &
Volcanic Island Arcs
Transform
• Plates move
past each
other
• Faults are
formed
Example of Transform: San
Andreas
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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12 plate tectonics notes