Across
1
Cold treeless Arctic plain
5
Large area covered with trees
6
Line dividing two countries
7
Vast body of salt water
10
Region between the two tropic lines
11
Raised area of land, smaller than a mountain
Down
2
City that is seat of government
3
Mountain that can erupt with lava
4
Wearing away of land by water or wind
6
Low-lying land surrounded by higher ground
8
Largest river in South America
9
Body of water surrounded by land