Across
1
Largest river in South America
4
Seasonal heavy rainfall
5
Imaginary line around the middle of Earth
6
Large natural elevation of earth
9
Deep narrow valley with steep sides
10
Long-term weather patterns of an area
11
Large body of water partly enclosed by land
Down
2
Line dividing two countries
3
Total number of people in an area
7
Region between the two tropic lines
8
Dry land with little rainfall