横向
1
Region between the two tropic lines
4
Largest river in South America
7
Line dividing two countries
8
Height above sea level
9
Land surrounded by water on three sides
纵向
2
Wearing away of land by water or wind
3
Region near the equator
5
Deep narrow valley with steep sides
6
Flat grassland in tropical regions
10
Steep rock face at edge of land