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Plate Tectonics

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by

Chris Myers

on 14 October 2009

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Transcript of Plate Tectonics

Plate Tectonics the first Earth formation was called Pangea theory which describes the large scale motions of Earth's lithosphere. The theory builds on the older concepts of continental drift, developed during the first decades of the 20th century by Alfred Wegener, and seafloor spreading, developed in the 1960s Seafloor Spreading
Additional evidence for plate tectonics came in the 1950s and 1960s
The rocks nearest the ridge were relatively young, but the rocks aged as the distance from the ridge increased. In addition, marine sediment was thicker and older further from the ridge, whereas the ridge itself had virtually no deposits of sediment.
After molten rock reaches the seafloor as lava, deep ocean water quickly cools and consolidates the material

The planet Earth is made up of three main shells: the very thin, brittle crust, the mantle, and the core; the mantle and core are each divided into two parts. All parts are drawn to scale on the cover of this publication, and a table at the end lists the thicknesses of the parts
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