Friday, October 18, 2013

Theory of plate techonics

   
I learned that places connect and the different places go on the map. Theory of continental drift by Wegner, in 1920 showed that the continents slide over the ocean floor. Geophysicists didn't agree, they thought that the ocean floor didn't have enough power to hold the continents and theory of seafloor spreading by Hess, in 1960, the movement of the continents showed sea floor spreading. Molten magma from under the earth's crust would fill in between the plates, in the Great Global Rift. When it cooled, it would spread apart and push the plates on either side of it, so the Atlantic Ocean would become, wider, but coastlines of the landmass wouldn't change dramatically. The theory of plate tectonics holds that the crust of the earth broken into 6 pieces and many other smaller ones, that any plate may consist, in part, of ocean floor, and in part, of a continent or islands.They collaborate with each and share their ideas. They come to an agreement and diside what to do from there. They may disagree ,but have to come to one solution as a group. They gather information and the scientist come together with all their ideas. 

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