The United States region labeled with the number 6 on the map above is known as the __________.
A.
Great Plains
B.
Coastal Plains
C.
Rocky Mountains
D.
Appalachian Mountains
![The United States region labeled with the number 6 on the map above is known as the A Great Plains B Coastal Plains C Rocky Mountains D Appalachian Mountains class=](https://us-static.z-dn.net/files/de8/b98e049d8945882934946ea3a7f7c088.png)