横向
1
Goods sold to another country
5
Landform where river meets the sea
6
Line dividing two countries
7
Largest river in South America
10
Distance east or west of prime meridian
纵向
2
Area where water covers the soil
3
One of seven major landmasses
4
Imaginary line around the middle of Earth
8
Steep rock face at edge of land
9
Goods brought in from another country
11
Low area between mountains
12
Narrow sea inlet between cliffs
13
Wearing away of land by water or wind