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Transcript 
Plate Tectonics
By: J. Farr
Harry Hess’s theory of Sea floor
spreading
Sea floor spreads apart
Magma moves upward and flows
through the cracks
Pangaea
http://www.ig.utexas.edu/research/projects/plates/images/pangea.jpg
Divergent Boundary
Definition:
Two Plates moving apart
dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm
Convergent Boundary
Oceanic Plate is forced under the less dense
Continental Plate.
courses.unt.edu/.../
exam1images/Fg16_09b.jpg
600 x 400 pixels - 131k
Transform Boundary
Two plates slide past one another
Wegener’s Theory
Provided evidence of Continental drift
but, didn’t know how or why.
Effects of Plate Tectonics
Fault Block Mountains
Strike Slip faults
Mountains
Volcanoes
Earthquakes
Fault Block Mountain
Diverging Plates
Ex: The Great Rift Valley of Africa
http://www.longitudebooks.com/images/book_large/EAF91.jpg
Strike Slip Faults Cause
Earthquakes
One plate is sliding past another.
Ex: San Andreas Fault
Plates move suddenly and vibrations are
felt within Earth which are felt as
Earthquakes
Converging Continental Plates
Plates move together
Force causes folding of rock layers
These become Mountain Ranges
Converging Oceanic Plates
One plate slides under the other
Melting occurs
Volcanoes are formed
Entire Mountain Ranges can be formed
Fun Fact
Hawaii is moving towards Japan at a rate
of 8.3cm per year.
Quiz
What are the 3 different types of
boundaries that occur with Sea Floor
Spreading?
What are some of the effects of Plate
tectonics?
Bibliography
California Content Standards
http://www.cde.ca.gov/cfir/
6th Grade Standards
Pangea
http://www.ig.utexas.edu/research/projects/plates/images/pangea.jpg
Diagram of Pangea
Convergent Boundary
courses.unt.edu/.../ exam1images/Fg16_09b.jpg
600 x 400 pixels - 131k
Divergent Boundary
dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm
Great Rift Valley of Africa
http://www.longitudebooks.com/images/book_large/EAF91.jpg
The Way The Earth Works
http://www.lhsgems.org/images/Tectonics.gif
diagram of Earth’s movement
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