Earthquakes

Feb 3rd, 2012
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The Red Sea is an example of Divergent Margins. Divergent margins are a result of two lithospheric plates that move apart. These Divergent Margins can occur either in continental or oceanic crust.

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Earthquakes 1EarthquakesJessica SvorinichAxia College University of Phoenix2EarthquakesThe Red Sea is an example of Divergent Margins. Divergent margins are a result of twolithospheric plates that move apart. These Divergent Margins can occur either in continental or oceanic crust.Schematic diagram of plate divergence. U.S. Geological Survey image.A divergent zone happens when the plates are pulled apart, not pushed apart. The circumstances that cause a divergent zone is " "slab pull" that arises where plates sink into the mantle under their own weight." This process is known as subduction. The divergent zone pulling motion can uncover the deep mantle rock of the asthenosphere. "As the pressure eases on the deep rocks, they begin to partially melt even though their temperature may fall. (This is called adiabatic melting.) The melted portion expands (as melted solids generally do) and rises, having nowhere else it can go. This magma then freezes onto the trailing edges of the diverging plates, and so the plates grow."http://geology.about.com/library/bl/blnutshell_divergence.htm Says "Lithospheric Plates diverge at a wide range of speeds, giving rise to differences in spreading ridges. Slow-spreading ridges like the Mid-Atlantic Ridge have steeper-sloping sides because it takes less distance for theirnew lithosphere to cool. They have relatively little magma production so that the ridge crest can develop a deep dropped-down block, a rift valley, at its cen

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