In analyzing certain geological features, it is often appropriate to assume that the
Chapter 14, Problem 23(choose chapter or problem)
In analyzing certain geological features, it is often appropriate to assume that the pressure at some horizontal level of compensation, deep inside Earth, is the same over a large region and is equal to the pressure due to the gravitational force on the overlying material. Thus, the pressure on the level of compensation is given by the fluid pressure formula. This model requires, for one thing, that mountains have roots of continental rock extending into the denser mantle (Fig. 14-34). Consider a mountain of height H 6.0 km on a continent of thickness T 32 km. The continental rock has a density of 2.9 g/cm3 , and beneath this rock the mantle has a density of 3.3 g/cm3 . Calculate the depth D of the root. (Hint: Set the pressure at points a and b equal; the depth y of the level of compensation will cancel out.) ountainMantle3.3 g/cm3Compensationb a levelHDyContinent T2.9 g/cm3 Figure 14-34 23.
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