The largest mountain range in the United States is the Rocky Mountains. This mountain range is 3,000 miles long, starting from British Columbia in Canada and extending south into New Mexico. The Rocky Mountains also form the world's second longest mountain range.
The Rocky Mountains is a range made up of over 100 smaller mountain ranges, including the Big Horn, Medicine Bow, Sacramento and Bitterroots ranges. Its highest point is Mount Elbert, which reaches 14,433 feet above sea level. This mountain is located in Colorado, 10 miles southwest of Leadville.
The Rocky Mountains formed over 70 million years ago. They are classified as fold mountains because they formed at a place where two tectonic plates meet.