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Transcript 
Structure of the Earth
Crust = solid outermost layer
Mantle = middle layer
Core = inner layer
outer core = liquid
inner core = solid
Internal Heat Drives Geological Activity
Why
do we have continental
drift? cool rock falls.
Convection:
hot rock rises,
WhyInternal
do we have
continental
drift?
Heat
Drives Geological
Activity
Earth has molten center
Convection: hot rock rises, cool rock falls
Convection current form in mantle
& the
solid
surface
of the Earth moves
The crust
moves
with
these currents
Surface of Earth Divided into Pieces called "Plates"
Surface of Earth Divided into Pieces called "Plates"
Figure 1-21
Most Volcanoes form at plate boundaries
Most Earthquakes occur at plate boundaries
Types of Plate Boundaries
Transform
boundaries
Figure 1-30
Transform boundary
Example: San Andreas Fault in CA
Transform boundary
Example: San Andreas Fault in CA
Types of Plate Boundaries
Divergent boundaries
Figure 1-25
Types of Plate Boundaries
Divergent boundaries
Example: Mid ocean ridge
Types of Plate Boundaries
Continental collision
Convergent boundaries
continental collision
Figure 1-27
Types of Plate Boundaries
Convergent boundaries
Subduction
Hawaii = Hot spot
What kind of plate boundaries are there off Washington’s coast?
Cascadia subduction zone in side view
http://en.wikipedia.org/wiki/Image:Subduction.jpg
http://www.nps.gov/archive/olym/geology/accretion.htm
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