Earthquakes - Earthquakes By Roger Williams Axia College...

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Earthquakes By Roger Williams Axia College Student SCI/245 Danielle Jannusch March 7, 2010
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Earthquakes are as old as the Planet Earth itself, and with good reason, because the Earths surface and subsurface are in constant movement. The surface also known as the lithosphere is fragmented into several large plates, and sits upon a hot underlying layer of ductile rock known as the asthenosphere. The lithosphere actually floats on the asthenosphere, and as the asthenoshpere moves in a slow constant motion, it causes the plates of the lithosphere to move as well. These plates collide with each other, split apart from each other, or slide past each other, and are known as the three interactions of plate tectonics. Divergent margins, is where two plates move apart from each other, and depending if this happens on land or under the ocean it can coincide with either a midocean ridge or a rift valley. Convergent margins, is where two plates collide with each other, and the result is one plate will slide beneath the other plate creating a subduction zone. In the ocean a convergent margin and subduction zone, then create deep oceanic trenches and volcanic eruptions on the ocean floor. When two continental plates collide, it is usually over an ancient subduction zone and forms a collision zone. The continental crust being too heavy to subduct, will then crumble and build up into giant mountain ranges. Transform fault margins, is where two plates slide along each other.
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This note was uploaded on 06/02/2010 for the course SCI SCI/245 taught by Professor Daniellejannusch during the Spring '10 term at University of Phoenix.

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Earthquakes - Earthquakes By Roger Williams Axia College...

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