As a rst approximation, the Earths continents may be
Chapter 9, Problem 9.29(choose chapter or problem)
As a rst approximation, the Earths continents may be thought of as granite blocks oating in a denser rock (called peridotite) in the same way that ice oats in water. (a) Show that a formula describing this phenomenon iswhere g is the density of granite (2.8 103 kg/m3), p is the density of peridotite (3.3 103 kg/m3), t is the thickness of a continent, and d is the depth to which a continent oats in the peridotite. (b) If a continent sinks 5.0 km into the peridotite layer (this surface may be thought of as the ocean oor), what is the thickness of the continent?
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