Plate Tectonics


Prior to World War II, humans were conformed with the idea that the Earth and its continents had been basically unchanged since the beginning of time. A German meteorologist, Alfred Wegener observed that the coastlines of the seven continents could be fitted together almost perfectly like a jigsaw puzzle. If fitted together, the geological dating the land would match as well as other geological features. He believed that this was more than coincidence, which happened to be the belief at the time. By putting all the continents together, he formed a large landmass that he named Pangea. This would also explain the same fossils found on 2 continents, separated by large oceans. Although ...

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the rigid ocean floor.
During WWII, people started to explore the ocean floor and discovered evidence that would prove Wegener's ideas about land movement. The most interesting feature of the ocean was the ridges running along the ocean floor. It was discovered that earthquakes were abundant along the ridges that let magma flow from them. The magma would flow out these ridges and push the Earth away from it. This sea floor spreading was how the continents had moved over millions of years. The earth's crust is in mobile sections called plates, moved by the circulation of magma in a layer of the earth called the mantle. The moving and colliding of plates form many of today's landforms such as the Himalayan Mountains. They were formed when India moved into Asia, colliding and making the shores of India go underneath Asia.
Although we have found much on , there are still some unanswered questions. The depths of the plates are still unknown. Scientists are still unsure on ...

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PAPER DETAILS
Added: 12/23/2003 01:05:22 AM
Category: Science & Nature
Type: Premium Paper
Words: 516
Pages: 2

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