1.
[Audio file]
Arctic Ocean
2.
[Audio file]
Mount McKinley
3.
[Audio file]
Vancouver Island
4.
[Audio file]
Rocky Mountains
5.
[Audio file]
Pacific Ocean
6.
[Audio file]
Great Basin
7.
[Audio file]
Colorado River
8.
[Audio file]
Sierra Nevada
9.
[Audio file]
Great Plains
10.
[Audio file]
Mississippi River
11.
[Audio file]
Hudson Bay
12.
[Audio file]
Canadian Shield
13.
[Audio file]
Appalachian Mountains
14.
[Audio file]
Atlantic Ocean
15.
[Audio file]
Great Lakes
