横向
1
Area where water covers the soil
4
Largest river in South America
6
Land surrounded by water on three sides
7
One of seven major landmasses
8
Goods sold to another country
纵向
2
Vast body of salt water
3
Seasonal heavy rainfall
5
Largest hot desert in the world
9
Wearing away of land by water or wind
10
Region surrounding the North Pole
11
Half of the Earth