Plate Tectonics
Plate tectonics is a recently developed science, and it can be used to explain a lot of phenomena on the Earth, such as earthquakes. There are actually two big fundamental theories of plate tectonics. One of the basic theories is called continental drift, and the other one is the theory of seafloor spreading. The theory of continental drift can not explain the power source of moving continents, so the theory is not complete. The theory of seafloor spreading is only focusing on the movements under water, and the theory still cannot find the evidence of the power source. After having better understanding the activities of volcanoes, earthquakes and terrestrial magnetism, the theory of plate tectonics was introduced about 30 years ago. The most obvious evidence of continental drifting is the remarkable fit of the South American and African continents. By recombining present continents, the Pangaea is still clearly seen. The graph bellow compares the Pangaea to the present continents. In 1912, Lothar Wegener introduced the theory of continental drift, which based on the evidences of geologic structures and plant and animal fossils. Here are three proofs that support the theory of continental d
Furlong, Kevin. "Plate Boundary Structure along the San Andreas Fault ." Online posting. 20 May. 2002 < http://www.geodyn.psu.edu/research/americas/sanandreas.html > The zone between two plates, which slides horizontally along each other, is called a transform-fault boundary or transform boundary. The San Andreas Fault zone is an example of transform boundary (see the graph below).
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PHYSICAL EVIDENCE, INTRODUCTION Plate, BOUNDARIES Convergent, Australia Indian, Robert Dietz, CONCLUSION Plate, BOUNDARY ZONES, Lothar Wegener, BOUNDARIES Divergent, MOTIONS Understanding, continental drift, seafloor spreading, plate tectonics, graph below, plate boundary, theory continental drift, theory continental, magnetic field, theory seafloor spreading, theory seafloor, plate boundary zone, crusts graph, boundary zone, online posting 20, posting 20 2002,
Approximate Word count = 894
Approximate Pages = 4 (250 words per page double spaced)
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