Across
1
Line dividing two countries
4
Large area covered with trees
5
Flat elevated area of land
10
Cold treeless Arctic plain
Down
2
Ridge of rock or coral near the surface
3
Imaginary line around the middle of Earth
6
Vast body of salt water
7
Landform where river meets the sea
8
Mountain that can erupt with lava
9
Goods sold to another country
11
Narrow sea inlet between cliffs