The Thickness of the Crust Under the Rocky Mountains

Why is the crust under the Rocky Mountains thicker compared to the crust under the regions to the east and west?

Explanation

The crust under the Rocky Mountains is thicker than the crust in the regions to the east and west. The Rocky Mountains were formed by tectonic forces pushing the crust upwards, resulting in the formation of tall mountain ranges. In contrast, the crust in the areas to the east and west of the Rocky Mountains has not experienced the same level of tectonic activity, so it is generally thinner and less elevated.

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