plate tectonics by: j. farr. harry hess’s theory of sea floor spreading sea floor spreads apart...
TRANSCRIPT
Harry Hess’s theory of Sea floor spreading
Sea floor spreads apartMagma moves upward and flows through the cracks
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
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
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