Across
1
Body of water surrounded by land
4
Deep narrow valley with steep sides
5
Cold treeless Arctic plain
7
Region surrounding the North Pole
10
Line dividing two countries
11
Flat grassland in tropical regions
12
Largest river in South America
Down
2
Steep rock face at edge of land
3
Area where water covers the soil
6
Imaginary line around the middle of Earth
8
Goods brought in from another country
9
Low-lying land surrounded by higher ground