How did the rocks in the Rocky Mountains form?

The Rocky Mountains formed 80 million to 55 million years ago during the Laramide orogeny, in which a number of plates began sliding underneath the North American plate. The angle of subduction was shallow, resulting in a broad belt of mountains running down western North America.

Age of rock: Precambrian and Cretaceous

Parent range: North American Cordillera

States/Provinces: List: British Columbia; Alberta; ...

Explanation:

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the answer is d.) potassium