横向
1
Area where water covers the soil
4
Goods brought in from another country
6
One of seven major landmasses
8
Ridge of rock or coral near the surface
纵向
2
Landform where river meets the sea
3
Largest river in South America
5
Wearing away of land by water or wind
7
Steep rock face at edge of land
9
Land surrounded by water on three sides