Across
1
Imaginary line around the middle of Earth
5
Large body of water partly enclosed by land
6
Cold treeless Arctic plain
7
Land surrounded by water
8
Largest river in South America
9
Area where water covers the soil
11
Deep narrow valley with steep sides
Down
2
Tool for finding directions
3
Mountain that can erupt with lava
4
Land surrounded by water on three sides
10
Ridge of rock or coral near the surface