The Appalachian Mtns are very, very old, highly eroded folded mountains.
The Appalachian mountains are a fold mountain.
fergenson
fault block
The Appalachian Mountains are the major mountain range in the Eastern US.
The Blue Ridge Mountains are part of the Appalachian Mountains.
The main Mountain range is the Appalachian Mountains.
Appalachian Mountains
Rocky Mountain is taller than Appalachian Mountain. But they are both the tallest mountains in North America
The Appalachian Mountains are a great deal older than the Rockies.
The Appalachian Mountains are in the East, the Rocky Mountains are in the west.
the Appalachian mountain range
Appalachian, the oldest mountain range in the US