After explorations of the range by Europeans, such as Sir Alexander Mackenzie, and Anglo-Americans, such as the Lewis and Clark Expedition, natural resources such as minerals and fur drove the initial economic exploitation of the mountains, although the range itself never experienced a dense population. At the end of the last ice age, humans began inhabiting the mountain range. Since then, further tectonic activity and erosion by glaciers have sculpted the Rockies into dramatic peaks and valleys. The angle of subduction was shallow, resulting in a broad belt of mountains running down western North America. The Rockies 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. Being the easternmost portion of the North American Cordillera, the Rockies are distinct from the tectonically younger Cascade Range and Sierra Nevada, which both lie farther to its west. Its southernmost point is near the Albuquerque area adjacent to the Rio Grande rift and north of the Sandia–Manzano Mountain Range. Depending on differing definitions between Canada and the U.S., its northern terminus is located either in northern British Columbia's Terminal Range south of the Liard River and east of the Trench, or in the northeastern foothills of the Brooks Range/ British Mountains that face the Beaufort Sea coasts between the Canning River and the Firth River across the Alaska- Yukon border. The Rocky Mountains stretch 3,000 miles (4,800 kilometers) in straight-line distance from the northernmost part of western Canada, to New Mexico in the southwestern United States. The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America.
0 kommentar(er)
