Across
1
Imaginary line around the middle of Earth
4
Steep rock face at edge of land
6
Region surrounding the North Pole
8
Largest river in South America
9
Land surrounded by water
Down
2
Distance east or west of prime meridian
3
Ridge of rock or coral near the surface
5
Deep narrow valley with steep sides
7
City that is seat of government
10
Total number of people in an area
11
Largest hot desert in the world
12
Low area between mountains