横向
1
Goods sold to another country
3
Body of water surrounded by land
5
Largest ocean on Earth
6
Wearing away of land by water or wind
7
Raised area of land, smaller than a mountain
9
Line dividing two countries
纵向
2
Area where water covers the soil
3
Distance north or south of equator
4
Largest river in South America
8
Distance east or west of prime meridian