Across
1
Cold treeless Arctic plain
5
Region near the equator
5
Region between the two tropic lines
7
Largest river in South America
8
Body of water surrounded by land
9
Line dividing two countries
Down
2
Imaginary line around the middle of Earth
3
Wearing away of land by water or wind
4
Narrow sea inlet between cliffs
6
Land surrounded by water
10
Largest ocean on Earth
11
Piece of land jutting into the sea