横向
1
Wearing away of land by water or wind
4
Chain or group of islands
6
Large area covered with trees
8
Goods brought in from another country
纵向
1
Where river meets the sea
2
Total number of people in an area
3
Region between the two tropic lines
5
Steep rock face at edge of land
7
Half of the Earth
9
Low-lying land surrounded by higher ground