The third alternative is correct (C).
The Rocky Mountains are a set of mountains located in the west of North America, has an extension of more than 4,800 km, and between 110 and 480 km wide. Its average altitude is 1200 meters. Its highest peak is Mount Elbert, with 4,401 meters of altitude, located in the American state of Colorado.
According to researchers and historians, the Rocky Mountains were formed about 70 million years ago, in the Cretaceous period. Since its formation, the phenomena caused by the winds and rains, such as erosion and glaciers that formed in the winter on the slopes of the mountains, have sculpted its shape, which continues to transform until today.
Thanks to the actions of the US and Canadian governments, much of the Rocky Mountains is preserved, with the incentive of local tourism, which is very relevant and helps to move the economy of that part of the countries.
