Across
1
Low-lying land surrounded by higher ground
4
Largest river in South America
6
Tool for finding directions
7
One of seven major landmasses
8
Height above sea level
Down
2
Wearing away of land by water or wind
3
Cold treeless Arctic plain
5
City that is seat of government
9
Steep rock face at edge of land
10
Vast body of salt water
11
Body of water surrounded by land