Question

An area where the earth's crust would be expected to be thin would be _____.

under the Pacific Ocean
in the Rocky Mountains
under the Mississippi River
in the plains region of the Midwestern U.S.

Answer 1

Withing the body of text this question was provided for, you should be able to find the passage, "The oceanic crust is thinner and denser than the continental crust."

Answer: The Pacific Ocean

Answer 2

I believe the correct answer would be the first choice: under the Pacific Ocean. You have to think that the Pacific Ocean is very, very deep, and it's bottom is deeper than the Rocky Mountain, the Mississippi River, and the plains. Therefore, the crust won't be as thick under the Pacific Ocean.