The Continental Divide of the Americas is located in the Rocky Mountains and designates the line at which waters flow either to the Atlantic or Pacific Oceans.Triple Divide Peak (8,020 feet (2,440 m)) in Glacier National Park is so named because water that falls on the mountain reaches not only the Atlantic and Pacific but Hudson Bay as well.The Great Basin and Columbia River Plateau separate these subranges from distinct ranges further to the west, most prominent among which are the Sierra Nevada, Cascade Range and Coast Mountains.The Rockies do not extend into the Yukon or Alaska, or into central British Columbia, where the Rocky Mountain System (but not the Rocky Mountains) includes the Columbia Mountains, the southward extension of which is considered part of the Rockies in the United States.The first mention of their present name by a European was in the journal of Jacques Legardeur de Saint-Pierre in 1752, where they were called " The Rocky Mountains are commonly defined as stretching from the Liard River in British Columbia south to the Rio Grande in New Mexico.
There is also Precambrian sedimentary argillite, dating back to 1.7 billion years ago.
Human population is not very dense in the Rocky Mountains, with an average of four people per square kilometer and few cities with over 50,000 people.
However, the human population grew rapidly in the Rocky Mountain states between 19.
Jackson Hole, Wyoming, increased 260%, from 1,244 to 4,472 residents, in 40 years.
The rocks in the Rocky Mountains were formed before the mountains were raised by tectonic forces.
The eastern edge of the Rockies rises dramatically above the Interior Plains of central North America, including the Sangre de Cristo Mountains of New Mexico and Colorado, the Front Range of Colorado, the Wind River Range and Big Horn Mountains of Wyoming, the Absaroka-Beartooth ranges and Rocky Mountain Front of Montana and the Clark Range of Alberta.