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The Theory of Plate Tectonics
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Earth's third layer
The outer core plays an important role in the world because the outer core makes the oceans and the atmosphere circulate.The same as the mantle, it is made out of magma and just like the inner core, it has a magnetic field.
http://www.cuhk.edu.hk/cpr/pressrelease/20100111%20SNSA/images/100111-2.jpg