Across
1
Large body of water partly enclosed by land
3
Cold treeless Arctic plain
5
Body of water surrounded by land
6
Wearing away of land by water or wind
7
Imaginary line around the middle of Earth
8
Flat elevated area of land
9
Flat grassland in tropical regions
Down
2
Height above sea level
4
Largest river in South America
10
Region surrounding the North Pole