The presence of 180-million-year-old salt domes in the Gulf Coast region of the United States 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)the Mississippi River used to carry salt water.

Question

Quizplus · Accepted Answer

The presence of 180-million-year-old salt domes in the Gulf Coast region of the United States suggests that a sea used to cover the area, but eventually evaporated. Over time, the salt left in the area would become concentrated and form salt domes. This hypothesis is supported by the fact that salt domes are often found in areas where ancient seas have evaporated.

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