Across
1
Largest river in South America
5
Imaginary line around the middle of Earth
6
Body of water surrounded by land
7
Flat grassland in tropical regions
8
Cold treeless Arctic plain
9
Physical features of land
11
Dry land with little rainfall
Down
2
Large natural elevation of earth
3
Vast body of salt water
4
One of seven major landmasses
10
Land surrounded by water
12
Tool for finding directions
13
Deep narrow valley with steep sides