How did the Rocky Mountains form?

A. The Rocky Mountains formed over two major phases of contractional deformation.
B. The Rocky Mountains formed primarily through volcanic activity.
C. The Rocky Mountains are a result of tectonic extension and rift processes.
D. The Rocky Mountains are a product of erosion and sedimentation.

The Rocky Mountains formed over two major phases of contractional deformation known as the Laramide Orogeny during the Late Mesozoic and Early Cenozoic. They were formed through low-angle subduction and have since been eroded and glaciated.

Explanation:

The Rocky Mountains formed over two major phases of contractional deformation known as the Laramide Orogeny. This deformation occurred during the Late Mesozoic and Early Cenozoic. The main growth of the Rocky Mountains happened during this time period.

Contractional deformation is the result of tectonic plate interaction and leads to mountain building. In the case of the Rocky Mountains, they were formed through low-angle subduction which caused deformation in the overlying plate.

Since their formation, the Rocky Mountains have been subjected to erosion and sedimentation which has shaped the landscape and rounded the highest peaks.

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