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Structure of the Earth
Crust = solid outermost layer
Mantle = middle layer
Core = inner layer outer core = liquidinner core = solid
Why do we have continental drift?Internal Heat Drives Geological Activity
Convection: hot rock rises, cool rock falls.
Why do we have continental drift?
Earth has molten centerConvection current form in mantleThe crust moves with these currents
Internal Heat Drives Geological Activity
Convection: hot rock rises, cool rock falls& the solid surface of the Earth moves
Surface of Earth Divided into Pieces called "Plates"
Figure 1-21
Surface of Earth Divided into Pieces called "Plates"
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 BoundariesDivergent boundaries
Figure 1-25
Types of Plate BoundariesDivergent boundaries
Example: Mid ocean ridge
Types of Plate Boundaries
Continental collision
Figure 1-27
Convergent boundariescontinental collision
Types of Plate Boundaries
SubductionConvergent boundaries
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
