Homework 2

Homework 2 - Lauren Dixon Mr. LaRock OCS 1005 February 3,...

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Lauren Dixon Mr. LaRock OCS 1005 February 3, 2011 Homework 2 1. What do the facts that (a) granite underlines the edges of continents and (b) basalt underlies deep-ocean basins suggest? (Hint: Consider thickness and densities) The lighter continental lithosphere floats in isostatic equilibrium above the level of the heavier lithosphere of the ocean basins. Continental crust is thicker than oceanic crust, and continental lithosphere is less dense than oceanic lithosphere. Although the granite is thicker than the basalt in the oceanic crust, it is also less dense than the oceanic crust or the Earth’s mantle. The basalt of the oceanic crust is very dense, much thinner, and younger than that of the continental crust. Continental crust is much older than oceanic crust because it does not go through the process of being reused due to seafloor spreading or subduction. 2. The terms leading and trailing are also used to describe continental margins. How do you suppose these words relate to active and passive, or Atlantic-type and Pacific-type used in the
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Homework 2 - Lauren Dixon Mr. LaRock OCS 1005 February 3,...

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