横向
1
Goods sold to another country
2
Steep rock face at edge of land
3
Seasonal heavy rainfall
5
Total number of people in an area
7
Largest river in South America
8
Line dividing two countries
纵向
2
Deep narrow valley with steep sides
4
Landform where river meets the sea
6
Mountain that can erupt with lava
9
Large body of water partly enclosed by land
10
Flat elevated area of land