横向
1
Seasonal heavy rainfall
3
Region between the two tropic lines
4
One of seven major landmasses
5
Largest hot desert in the world
6
Largest river in South America
7
Region surrounding the North Pole
8
Total number of people in an area
9
Large natural stream of water
10
Chain or group of islands
纵向
1
Large natural elevation of earth
2
Physical features of land
3
Cold treeless Arctic plain
4
Deep narrow valley with steep sides