Across
1
Region surrounding the North Pole
4
Ridge of rock or coral near the surface
5
Line dividing two countries
7
Flat grassland in tropical regions
Down
2
Piece of land jutting into the sea
3
Cold treeless Arctic plain
6
Landform where river meets the sea
8
Deep narrow valley with steep sides
9
Largest river in South America
10
Large slow-moving mass of ice