Across
1
Steep rock face at edge of land
3
Line dividing two countries
5
Wearing away of land by water or wind
8
Chain or group of islands
11
Imaginary line around the middle of Earth
12
Large body of water partly enclosed by land
13
Ocean between Americas and Europe/Africa
Down
2
Large natural stream of water
4
Region near the equator
6
Largest ocean on Earth
7
Cold treeless Arctic plain
9
Large slow-moving mass of ice
10
Total number of people in an area