The presence of 180-million-year-old salt domes in the Gulf Coast region of the U.S. indicates that
A) the area was once volcanically active.
B) the area was subjected to plate collisions, which caused metamorphism to occur.
C) subsidence is now occurring due to the withdrawal of magma from the region.
D) a sea used to cover the area but subsequently evaporated.
E) None of these are indicated.

Question

Quizplus · Accepted Answer

The presence of 180-million-year-old salt domes indicates that a sea used to cover the Gulf Coast region, and subsequently evaporated. As the sea evaporated, the minerals left behind concentrated and eventually formed salt domes.

The Presence of 180-Million-Year-Old Salt Domes in the Gulf Coast