Across
1
Line dividing two countries
4
Cold treeless Arctic plain
5
Large natural elevation of earth
6
Chain or group of islands
8
Region surrounding the North Pole
13
Area where water covers the soil
Down
2
Landform where river meets the sea
3
Mountain that can erupt with lava
4
Region near the equator
7
Half of the Earth
9
Long-term weather patterns of an area
10
Largest river in South America
11
Land surrounded by water
12
Large area covered with trees