The concept of ________ includes the idea that crustal rocks are floating in a kind of gravitational balance and that their elevation depends on their density contrast to the underlying upper mantle.
A)orogeny
B)isostasy
C)subsidency
D)isotropy

Question

Quizplus · Accepted Answer

The concept described is that of isostasy, which refers to the gravitational equilibrium between Earth's crust and its underlying mantle. Isostatic balance means that areas of higher elevation have a lower density in order to "float" atop the denser material beneath, while areas of lower elevation have a higher density.

The Concept of ________ Includes the Idea That Crustal Rocks