Across
1
Large body of water partly enclosed by land
3
Large natural elevation of earth
4
Height above sea level
6
Half of the Earth
7
Cold treeless Arctic plain
11
Largest river in South America
12
Ocean between Americas and Europe/Africa
Down
2
Imaginary line around the middle of Earth
5
Total number of people in an area
8
Region near the equator
9
Steep rock face at edge of land
10
Flat grassland in tropical regions