Across
1
Deep narrow valley with steep sides
5
Region surrounding the North Pole
6
Mountain that can erupt with lava
7
Largest river in South America
8
Largest hot desert in the world
Down
2
Vast body of salt water
3
Region between the two tropic lines
4
Land surrounded by water on three sides
9
Flat elevated area of land
10
Low area between mountains
11
Large slow-moving mass of ice