Chap 3 Questions

Chap 3 Questions - Sarah Edwards Mr. LaRock OCS 1005 29...

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Sarah Edwards Mr. LaRock OCS 1005 29 January 2008 1. Q: Would the most violent earthquakes be associated with spreading centers or with subduction zones? Why? A: The most violent earthquakes would be associated with subduction zones because in these areas, a plate is, often violently, being sucked back into the asthenosphere. This usually happens where the oceanic crust is being subducted by the lighter continental crust. The oceanic crust will move down in quick spurts which can cause the formation of trenches, terrible earthquakes, and tsunamis. 2. Q: Describe the mechanism that powers the movement of the lithospheric plates. A: Lithospheric plates float on top of the pliable layer beneath it, know as the asthenosphere. These plates are mapped by earthquakes and the plates are moved by the arrival of new seafloor, caused by seafloor spreading. This whole arrangement is known as plate tectonics. Lithospheric plates can be moved either by sliding plates, which move off of a rising center, or by being pulled downward
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Chap 3 Questions - Sarah Edwards Mr. LaRock OCS 1005 29...

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