Across
1
Dry land with little rainfall
5
Vast body of salt water
6
Total number of people in an area
7
Large slow-moving mass of ice
9
Largest river in South America
11
Large area covered with trees
Down
2
Area where water covers the soil
3
Imaginary line around the middle of Earth
4
Cold treeless Arctic plain
8
Piece of land jutting into the sea
10
Ridge of rock or coral near the surface
12
Tool for finding directions
13
Line dividing two countries