Across
1
Half of the Earth
3
Flat grassland in tropical regions
6
Deep narrow valley with steep sides
7
Large body of water partly enclosed by land
9
Flat elevated area of land
10
Narrow sea inlet between cliffs
11
Large slow-moving mass of ice
Down
2
Largest ocean on Earth
4
Cold treeless Arctic plain
5
Imaginary line around the middle of Earth
8
Steep rock face at edge of land
12
Low area between mountains