Across
1
Tool for finding directions
5
Land surrounded by water on three sides
6
Low-lying land surrounded by higher ground
9
Low area between mountains
10
Where river meets the sea
11
Mountain that can erupt with lava
12
Steep rock face at edge of land
Down
2
Large natural elevation of earth
3
Largest river in South America
4
Half of the Earth
7
City that is seat of government
8
Total number of people in an area