Chap 4 Questions

Chap 4 Questions - Sarah Edwards Mr. LaRock OCS 1005...

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Sarah Edwards Mr. LaRock OCS 1005 January 31, 2008 1. Although granite is thicker than the basalt of the oceanic crust, is also less dense than either the oceanic crust or the Earth’s mantle; therefore, since it makes up the continental crust, this area is able to isostatically “float” above both of these lower layers. This also explains why the continental crust is so much older than that of the oceanic crust, because it does not go through the process of being “recycled” by subduction and seafloor spreading. The basalt of the oceanic crust is very dense but it is also thinner than the oceanic crust, and it is younger. 2. The term trailing margin would likely be associated with passive margin building, typical of the Atlantic Ocean. These margins are formed in areas of lower tectonic activity where the margins face diverging plates. On the other hand, leading margins relate to the active margins of the Pacific Ocean, located along converging plates, which are characterized by a steep drop off in the shelf. This drop can be caused by quick
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This note was uploaded on 03/22/2011 for the course OCS 1005 taught by Professor Condrey during the Spring '08 term at LSU.

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Chap 4 Questions - Sarah Edwards Mr. LaRock OCS 1005...

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