The Rocky Mountains are tall and more pointed compared to the Appalachian Mountains which are smaller and have duller points. This shows that the Appalachian Mountains have had more time to erode while the Rocky Mountains have not.
Rocky mountains
You must be thinking of the Rocky Mountains.
the rocky mountains
As mountains go, they are relatively new, and have not weathered.
The Rocky Mountains and the Appalachian Mountains.
Europes Ural mtns or The U.S's rocky mountains
Missouri river
The Great Plains.
The Great Plains is the huge expanse of flatlands from the Rocky Mountains eastward to the Mississippi River.
The presence of extrusive igneous rock in the southern half of the Rocky Mountains suggests that this section was once a volcanic area where lava flowed on the surface, indicating a history of volcanic activity in that region.
The Rocky Mountains
The Rocky Mountains are in Canada.We will climb the rocky mountains this week.