Across
1
Region near the equator
4
Large body of water partly enclosed by land
5
Wearing away of land by water or wind
6
Largest river in South America
7
Largest hot desert in the world
8
Region surrounding the North Pole
11
Flat grassland in tropical regions
Down
2
Deep narrow valley with steep sides
3
Large natural elevation of earth
4
Large slow-moving mass of ice
9
City that is seat of government
10
Imaginary line around the middle of Earth
12
Piece of land jutting into the sea
13
Cold treeless Arctic plain