Across
1
Cold treeless Arctic plain
4
Mountain that can erupt with lava
6
Region surrounding the North Pole
7
Height above sea level
8
Largest river in South America
9
Goods sold to another country
10
Large natural elevation of earth
Down
1
Region near the equator
1
Region between the two tropic lines
2
Vast body of salt water
3
Low area between mountains
5
Flat grassland in tropical regions