Why Is the Average Elevation of the Continents Higher Than

question 43

Multiple Choice

Why is the average elevation of the continents higher than the average elevation of the seafloor?

• A)because melting of large ice caps has caused isostatic rebound of the continents
• B)because oceanic crust is composed of denser rocks than the continental crust
• C)because the continents are supported by upwelling mantle currents
• D)because subduction pulls down the seafloor

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