Across
1
Total number of people in an area
3
Ridge of rock or coral near the surface
7
Goods sold to another country
8
Region between the two tropic lines
9
Low-lying land surrounded by higher ground
10
Large area covered with trees
11
Largest hot desert in the world
Down
2
Low area between mountains
4
Region surrounding the North Pole
5
One of seven major landmasses
6
Cold treeless Arctic plain
10
Narrow sea inlet between cliffs
12
Vast body of salt water