Across
1
Region between the two tropic lines
3
Largest river in South America
5
Ridge of rock or coral near the surface
7
Total number of people in an area
8
City that is seat of government
Down
2
Imaginary line around the middle of Earth
3
Region surrounding the North Pole
4
Mountain that can erupt with lava
6
Largest hot desert in the world
9
Deep narrow valley with steep sides
10
Chain or group of islands