横向
1
Large natural stream of water
3
Total number of people in an area
4
Dry land with little rainfall
6
Region near the equator
9
Deep narrow valley with steep sides
纵向
2
Region between the two tropic lines
5
Landform where river meets the sea
6
Physical features of land
7
Wearing away of land by water or wind
8
Land surrounded by water on three sides