Disc2 - Plate Tectonics

Disc2 - Plate Tectonics - 3 Convection Which part(s of the...

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Name_________________________ Section________________________ Discussion 2: Interior of the Earth and Plate Tectonics February 8, 2012 1) Volume, density and Mass of the core: The volume V of a sphere of radius r is given by 3 4 3 r V The radius of the Earth is 6370 km, and the core-mantle boundary is located approximately 2900 km below the surface of the Earth. Assume the average density of the core is approximately 10,700 kg/m3 and the average density of the Earth is 5500 kg/m3. What volume fraction of the Earth is taken up by it’s core? What fraction of the Earth’s mass is the mass of the core? 2) Continents and oceans: What are the two most important differences between the oceanic and the continental crusts? Is it possible for a continent to subduct beneath an ocean? Justify your answer.
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Unformatted text preview: 3) Convection: Which part(s) of the deep Earth undergo convective motion? What drives convection in this(ese) area(s)? 1 What is (are) the manifestation(s) of this(ese) convective process(es) on the surface? 4) Earthquakes: Later in the class, we will see that most of the earthquake prone areas are confined in certain areas. In view of plate tectonic processes, what kind of plate margins are associated with earthquakes? What is the predominant tectonic mechanism behind earthquakes? 5) Isostasy: Discuss, briefly, the concept of isostasy. What leads to the isostatic uplift of a mountain? Can isostatic uplift of mountains influence regional climate patterns? 2...
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