Across
1
Height above sea level
6
Low-lying land surrounded by higher ground
7
Largest river in South America
10
Large area covered with trees
11
Imaginary line around the middle of Earth
Down
2
Body of water surrounded by land
3
Cold treeless Arctic plain
4
Flat elevated area of land
5
Low area between mountains
6
Line dividing two countries
8
Region near the equator
9
Large slow-moving mass of ice
12
Goods brought in from another country