Ch. 6 hw - each other. At a convergent boundary, two plates...

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Crystal Cozart September 2, 2009 ESC1000 Ch. 6 HW 3.) 8.) Oceanic crust is between 4 and 7 kilometers thick and is composed mostly of dark, dense basalt. While oceanic crust is thinner, it is more dense than continental crust. Continental crust is about 20 to 40 kilometers think, although under mountain ranges it can be as much as 70 kilometers think. 12.) There are seven major tectonic plates: African, Eurasian, Indian-Australian, Antarctic, Pacific, North American, and South American. 13.) A plate boundary is a fracture that separates one plate from another. Neighboring plates can move relative to one another in three ways. At a divergent boundary, two plates move apart from
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Unformatted text preview: each other. At a convergent boundary, two plates move toward each other, and at a transform boundary, they slide horizontally past each other. The forces generated at a plate boundary build mountain rangers and cause volcanic eruptions and earthquakes. 14.) The interior can be viewed as an enormous heat engine that needs to move heat from the core to the cooler surface. The lithosphere becomes denser as it moves away from a spreading center and cools. It can no longer float on the asthenosphere and sinks into the mantle in a subduction zone, dragging the trailing portion of the plate over the asthenosphere....
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