Across
1
Cold treeless Arctic plain
5
Region near the equator
6
Largest river in South America
8
Tool for finding directions
11
Distance east or west of prime meridian
Down
2
Deep narrow valley with steep sides
3
Wearing away of land by water or wind
4
Region surrounding the North Pole
7
Large natural stream of water
8
One of seven major landmasses
9
Region between the two tropic lines
10
Large slow-moving mass of ice