Seismic studies indicate that continental crust beneath mountains and cratons is essentially the same thickness.

Question

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Continental crust beneath mountains is generally thicker than beneath cratons. Mountains have deep roots of crustal material that extend into the mantle, which is a reflection of isostasy, whereas cratons, being the stable, ancient parts of the continental crust, typically have a uniform thickness that is less than that found beneath mountain ranges.

Seismic Studies Indicate That Continental Crust Beneath Mountains and Cratons