A thrust fault increases the thickness of the crust as it moves toward a continental interior in a mountain belt; yet the crust beyond the mountain front stays the same thickness. Isostasy would suggest that the area at the mountain front, where the thrust emerges, should _______over time.
A) near sea level
B) uplift
C) stay the same
D) subside

Question

Quizplus · Accepted Answer

Isostasy suggests that as the crust thickens and becomes heavier at the mountain front due to the thrust fault, it will sink or subside to maintain gravitational equilibrium.

A Thrust Fault Increases the Thickness of the Crust as It