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Transcript 
Plate Tectonics Hypothesis
Earth’s crust is broken into about 12 rigid plates
Plates move ~ cm/year 3 types of plate boundaries:
divergent creation of new seafloor
convergent
return of crust to Earth’s interior
transverse
Earth’s Tectonic Plates
Spreading
Subduction
transform
Plate motion
Divergent plate boundary
East Pacific Rise Topography
opening at 15 cm/yr
East-African Rift
opening at 6 mm/yr
Convergent Plate Boundaries:
Ocean-Ocean
Kavachi, Soloman Islands March 26, 2002
Convergent Plate Boundaries:
Ocean-Continent
Andes
Convergent Plate Boundaries:
Continent-Continent
Himalayas
Examples of Plate Boundaries
O-C
convergent
O-O
convergent
O-O
divergent
C-C
divergent
O-O
divergent
O-O
divergent
O-C
convergent
Transform Boundaries
Mid-Atlantic Ridge
San Andreas Fault
Transform Boundaries
Mid-Atlantic Ridge
San Andreas Fault
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