Tectonics the Ups and Downs Term Paper

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As the mantle heats and cools unevenly, areas of differing density slowly move through the mantle. As they do, these areas of density variance have effects on surface features on the crust. For instance, there is a denser mass in the mantle shaped like a mushroom thousands of miles across and rising 900 miles from the Earth's core. The gentle rise of this mass has had the immediate effect of producing the African superswell, proof that motion in the mantle can have vertical as well as horizontal effects on the crust (Gurnis 40).

The lessons learned from the African superswell have been applied with great success in other parts of the world -- such as North American and Australia.

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The result has been a new understanding of the inner dynamics of the Earth. The motions of the mantle account for complex uplift situations throughout the world, and a deeper understanding of the fluid behaviors of the mantle will be crucial for our understanding of the surface formations on the planet.

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