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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.

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Presentation on theme: "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."— Presentation transcript:

1 Plate Tectonics By: J. Farr

2 Harry Hess’s theory of Sea floor spreading Sea floor spreads apart Magma moves upward and flows through the cracks

3 Pangaea http://www.ig.utexas.edu/research/projects/plates/images/pangea.jpg

4 Divergent Boundary dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm Definition: Two Plates moving apart

5 Convergent Boundary Oceanic Plate is forced under the less dense Continental Plate. courses.unt.edu/.../ exam1images/Fg16_09b.jpg 600 x 400 pixels - 131k

6 Transform Boundary Two plates slide past one another

7 Wegener’s Theory Provided evidence of Continental drift but, didn’t know how or why.

8 Effects of Plate Tectonics Fault Block Mountains Strike Slip faults Mountains Volcanoes Earthquakes

9 Fault Block Mountain Diverging Plates Ex: The Great Rift Valley of Africa http://www.longitudebooks.com/images/book_large/EAF91.jpg

10 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

11 Converging Continental Plates Plates move together Force causes folding of rock layers These become Mountain Ranges

12 Converging Oceanic Plates One plate slides under the other Melting occurs Volcanoes are formed Entire Mountain Ranges can be formed

13 Fun Fact Hawaii is moving towards Japan at a rate of 8.3cm per year.

14 Quiz What are the 3 different types of boundaries that occur with Sea Floor Spreading? What are some of the effects of Plate tectonics?

15 Bibliography California Content Standards http://www.cde.ca.gov/cfir/ 6 th 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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