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Plate Tectonics

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by

Jenna Perryman

on 20 October 2012

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Transcript of Plate Tectonics

Plate Tectonics Plate Tectonics: A theory explaining the structure of earth's crust Pangaea A giant land mass called Pangaea, also known as the continental drift theory, is what our seven continents started out as. As years have passed they started to move away from each other, and that is why some of the continents look like they fit together. Continental Plates There are about sixteen continental plates. This
includes the Eurasian plate, the Australian-Indian plate, Philippine plate, Pacific plate, Juan de Fuca plate, Nazca plate, Cocos plate, North American plate, Caribbean plate, South America plate, African plate, Arabian plate, Antartic plate, and the Scotia plate. Colliding Plates When the plates collide head on they push up and form mountains like the Himalayas and the Rockies. When one plate goes under the other one they cause a subduction zone and the one that went under is crushed and melts. This process creates volcanoes because the magma (molten rock) comes to the top. When two plates slide past each other, they create a transform fault, like the San Andreas fault. An earthquake can occur when any of these things happen. Fun Facts Alfred Wegener, a German, published his theory about the plate tectonics in 1912, but no one believed him until the 1930's.
The first evidence that the sea floor was spreading was found in the Atlantic Ocean. What
We
Learned We learned that the continental plates move about half an inch per year. We also learned that scientists looked at fossils from different continents and found that the fossils in Australia were the same as the ones in Southern Asia. By: Haley Baldwin
and
Jenna Perryman The End!!! The End!!!
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