1. 12. Plate Tectonics

4. 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

5. The Three Types of Plate Boundaries

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

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

9. Transform
• Plates move
past each
other
• Faults are
formed

10. Example of Transform: San
Andreas

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