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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. Pangaea. http://www.ig.utexas.edu/research/projects/plates/images/pangea.jpg. Divergent Boundary. Definition: Two Plates moving apart.
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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
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.jpg600 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.jpg600 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