横向
1
Region between the two tropic lines
4
Largest river in South America
8
Dry land with little rainfall
9
Goods sold to another country
10
Goods brought in from another country
纵向
2
Wearing away of land by water or wind
3
Largest ocean on Earth
5
Landform where river meets the sea
6
Piece of land jutting into the sea
7
Visual representation of an area
11
Height above sea level
12
Area where water covers the soil
13
Large area covered with trees