The characteristic that is NOT associated with the Rocky Mountains is Tropical climate.

The Rocky Mountains are known for their towering peaks, including some of the highest in North America. The region features a diverse and rugged landscape, with cliffs, deep valleys, and various geological formations. Many areas within the Rockies are covered in dense forests, particularly at lower elevations, composed of coniferous trees and other vegetation. The climate in the Rockies varies with elevation, but it is predominantly temperate to alpine, with cold winters and mild summers, rather than tropical.