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Earthquakes Essay

1291 words - 5 pages

Axia CollegeSeptember 20, 2009Looking at the pieces of a jigsaw puzzle, one can see how the 3D puzzle floatingaround are then locked in place. But, the earth crusts do not fall into the form of thejigsaw puzzle category, as the earth crust is not locked in place. Nevertheless, the platesconstantly stay in motion. Trying to see the plates as they converse and moves againsteach other may not be visual to individuals. Individuals’ can only feel the result throughan earthquake. This paper will discuss the three types of plate boundaries, their motion,and, earthquakes.The lithosphere or the outermost shell of the earth is 100 kilometers. All this area isthe uppermost area of the mantle and is also composed of the crust. Numerous plates thatare smaller in size makes up the lithosphere , in total there are seven plates. The earthsseismic and volcano activity make an occurrence where the plates falls together whetherat the plate margins or boundaries itself. There are three ways the earth falls together inone. Divergent plate boundary is one of the three ways. Divergent occurs when the twoplates Separates and then starts to spread as new material coming from a generatedmantle. In cross section, the Earth releases its internal heat by convecting, or boilingmuch like a pot of pudding on the stove. Hot asthenospheric mantle rises to the surfaceand spreads laterally, transporting oceans and continents as on a slow conveyor belt. Thespeed of this motion is a few centimeters per year, about as fast as individuals fingernailsgrow. The new lithosphere, created at the ocean spreading centers, cools as it ages andeventually becomes dense enough to sink back into the mantle. The subducted crustreleases water to form volcanic island chains above, and after a few hundred millionyears will be heated and recycled back to the spreading centers (USGS). According to theUSGS, one individual can see how evident that when the new material rises the rigidplates is now tied in together. The oceanic ridges are the asthenospheric spreadingcenters, creating new oceanic crust. Subduction zones appear as deep oceanic trenches.Most of the continental mountain belts occur where plates are pressing against oneanother. The white squares locate examples given here of the different tectonic andearthquakes environments (Louie and Anderson, May 2001).Plates however is destroyed elsewhere, and the process now is called the convergentplace boundaries. Convergent boundaries are two plates that meet and collided together,as a result earthquakes, volcano and crustal deformation occurs. The plates aredifinitley force under each other. Convergent plate boundaries can be found oceanicareas. According to the Geology website; here is one of the ways convergentboundaries operates. “When continental and oceanic plates collides the thinner and moredense oceanic plate is overridden by the thicker and less dense continental plate. Theoceanic plate is forced down into the mantle in a process...

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