横向
1
Total number of people in an area
5
Largest hot desert in the world
7
Physical features of land
8
Ridge of rock or coral near the surface
12
Large area covered with trees
13
Dry land with little rainfall
纵向
2
Area where water covers the soil
3
Wearing away of land by water or wind
4
Half of the Earth
6
Seasonal heavy rainfall
9
Narrow sea inlet between cliffs
10
Large natural elevation of earth
11
Distance east or west of prime meridian