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Plate Tectonics
Plate Tectonics
• The theory that pieces of
Earth’s lithosphere are in
constant motion, driven by
convection currents in the
mantle.
• CD + SFS + “plates” = Plate Tectonics!
Faults
• Breaks in earth’s crust
where rocks move
Faults meet at Boundaries
• 3 kinds of boundaries:
• Convergent
• Divergent
• Transform
Divergent Boundary
• Where 2 plates move apart
• Mid-ocean ridge (oceanic)
• Rift Valley (continental)
Mid-Ocean Ridge (SFS)
Rift Valley
Convergent Boundary
• Where 2 plates collide
• Oceanic-Oceanic
• Oceanic-Continental
• Continental-Continental
• Outcome determined by DENSITY
Oceanic-Oceanic
Convergent Boundary
Oceanic-Continental
Convergent Boundary
Continental-Continental
Convergent Boundary
Transform Boundary
• 2 plates slide past each
other in opposite directions
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