Plate Tectonics

By: J. Farr

Harry Hess’s theory of Sea floor spreading

Sea floor spreads apartMagma moves upward and flows through the cracks

Pangaea

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

Divergent Boundary

dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm

Definition:Two Plates moving apart

Convergent BoundaryOceanic Plate is forced under the less dense Continental Plate.

courses.unt.edu/.../ exam1images/Fg16_09b.jpg600 x 400 pixels - 131k

Transform BoundaryTwo 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 MountainsStrike Slip faultsMountainsVolcanoesEarthquakes

Fault Block Mountain

Diverging PlatesEx: 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 FaultPlates move suddenly and vibrations

are felt within Earth which are felt as Earthquakes

Converging Continental Plates

Plates move togetherForce causes folding of rock layersThese become Mountain Ranges

Converging Oceanic Plates

One plate slides under the otherMelting occursVolcanoes are formedEntire 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?

BibliographyCalifornia 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