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How old are the Rocky Mountains?

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The Rocky Mountains took shape during a period of intense plate tectonic activity that formed much of the rugged landscape of the western United States. ... During the last half of the Mesozoic Era, the Age of the Dinosaurs, much of today's California, Oregon, and Washington were added to North America. read more

The Rocky Mountains, also known as the Rockies, are a major mountain range in western North America. The Rocky Mountains stretch more than 3,000 miles (4,800 km) from the northernmost part of British Columbia, in western Canada, to New Mexico, in the Southwestern United States. read more

The Rocky Mountains are a vast mountain range situated in the western piece of North America in the United States and Canada. The"Rockies" as they are additionally known, go through northern New Mexico and into Colorado, Wyoming, Idaho and Montana. In Canada, the reach extends along the outskirt of Alberta and British Columbia. read more

The Rocky Mountains include at least 100 separate ranges, which are generally divided into four broad groupings: the Canadian Rockies and Northern Rockies of Montana and northeastern Idaho; the Middle Rockies of Wyoming, Utah, and southeastern Idaho; the Southern Rockies, mainly in Colorado and New Mexico; and the Colorado Plateau in the Four Corners region of Utah, Colorado, New Mexico, and Arizona. read more

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