横向
1
Total number of people in an area
6
Height above sea level
8
Ridge of rock or coral near the surface
10
Line dividing two countries
纵向
2
Goods sold to another country
3
Imaginary line around the middle of Earth
4
Steep rock face at edge of land
5
Cold treeless Arctic plain
7
Large natural elevation of earth
9
Large slow-moving mass of ice
11
Largest hot desert in the world
12
Half of the Earth