Across
1
Mountain that can erupt with lava
4
Body of water surrounded by land
6
Line dividing two countries
8
Chain or group of islands
9
Cold treeless Arctic plain
10
Distance east or west of prime meridian
12
Region between the two tropic lines
Down
2
Large natural elevation of earth
3
Area where water covers the soil
5
Large area covered with trees
7
Imaginary line around the middle of Earth
11
Largest hot desert in the world