Across
1
Total number of people in an area
6
Largest river in South America
8
Region between the two tropic lines
9
Region surrounding the North Pole
10
Raised area of land, smaller than a mountain
11
Large area covered with trees
Down
2
Large natural elevation of earth
3
Low area between mountains
4
Vast body of salt water
5
Wearing away of land by water or wind
7
City that is seat of government
12
One of seven major landmasses
13
Ridge of rock or coral near the surface