In General, Which of the Following Statements About Elevated, Compressive

question 21

Multiple Choice

In general, which of the following statements about elevated, compressive orogens is true?

• A) Crust was thickened by previous mountain building; as isostatic uplift and erosion proceed, the crust is gradually reduced in thickness.
• B) Crust is sucked into the mantle by increased convection under mountain belts.
• C) Crust was thinned by extensional faulting in the past; isostatic uplift and erosion cause the crustal root to gradually thicken.
• D) Crust is flattened by increased atmospheric pressure over mountain belts.

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