Chapter 26, Problem 3RAT

Solution

To determine: The correct option for the statement “Which part of Earth's crust is most dense?".

Answer:

The correct option for the statement “Which part of Earth's crust is most dense?" is option (c).

Explanation:

The upper mantle part of the structure of the Earth contains the asthenosphere. It is denser than the oceanic and continental crust and lithosphere part. It makes the asthenosphere part densest part of the Earth's crust. The asthenosphere is only 6 percent of the total mantle of the Earth. It lies between 100 kilometers to 410 kilometers beneath the surface of the Earth.

The asthenosphere contains more magnesium and calcium than the crust. It becomes denser because of the temperature and pressure increase with an increase in depth. Thus, it is the densest part of the crust of the Earth.

Conclusion:

Therefore, the correct option for the statement “Which part of Earth's crust is most dense?" is option (c).