The Ancestral Rockies were unique because they were the only mountain ranges in North America to form ____.

Question

Quizplus · Accepted Answer

The Ancestral Rockies formed via intracratonic deformation, which means they formed within a continent rather than at a plate boundary. They were unique in North America because they formed in this way, whereas other North American mountain ranges (such as the Appalachian Mountains) formed via continental-continental collision or subduction. The direction of the deformation was not necessarily perpendicular or parallel to anything specific, so options C and E can be eliminated. Volcanism was not the primary factor in the formation of the Ancestral Rockies, so option A can also be eliminated.

The Ancestral Rockies Were Unique Because They Were the Only