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Submitted by omgzjasoncaruso on April 30, 2006
Category: Science
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Plate Tectonics
By; Jason Caruso
Period: 6
The beginnings of the theory of plate tectonics date to around 1920, when Alfred
accounts of how today's continents were once a large supercontinent that slowly drifted to
Wegener. The German meteorologist and geophysicist, presented the first detailed
the positions there at today. Others created evidence, but continental drift did not attract
wide interest until the late 1950s.When scientists found the alignment of magnetic
particles in rock responded to the earth's magnetic field of that time. But paleomagnetic
polar changes showed that all continents had moved across the earth over time.
Evidence for movement and changes in the geosphere over time.
According to plate tectonics, the ocean basins are viewed as features that have
theoretically opened and closed, first tearing and then putting back together the
continental masses. Which are permanent features on the earth's surface. Geologists now
believe that the continents were put together 200 million years ago at the beginning of the
Mesozoic time to form a supercontinent called Pangaea. Initial cracking along a northern
continental mass, Laurasia, and a southern continental mass, Gondwanaland. Then plate
movements caused North American and Eurasian separation...
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