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 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

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

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

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 6 th Grade Standards Pangea 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 The Way The Earth Works diagram of Earth’s movement