Answer :

Final answer:

The primary formation of the Rocky Mountains occurred during the Laramide Orogeny from the Late Mesozoic to the Early Cenozoic era. Tectonic activity, such as low-angle subduction, was responsible for the uplift and shaping of the Rockies. In recent times, rapid population growth in the Mountain West has contributed to the development and economic growth in the Rocky Mountain region.

Explanation:

The development of the Rocky Mountains, also known as the Rockies, has been a subject of study for many geologists. The Rockies have been shaped by various geological processes over millions of years. The major phase of their formation occurred during the Laramide Orogeny which took place from the Late Mesozoic to the Early Cenozoic era, approximately 80 million to 55 million years ago. During this time, the tectonic activity resulted in low-angle subduction, which caused significant deformation in the overlying plate and led to the uplift and thrusting of rock formations. This mountain-building event created the large and impressive mountain range we see today, stretching from New Mexico to Northern Canada. The Rockies, however, are no longer growing and have undergone glaciation and erosion, shaping their current appearance. In addition to natural processes, the population growth in the Mountain West region, including states like Nevada, Utah, Idaho, and Colorado, has also contributed to development in and around the Rocky Mountains. This growth outpaces the average rate in the United States, indicating a significant demographic and economic development in the region that is tied to the mountainous landscape.

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