横向
1
Body of water surrounded by land
3
Largest ocean on Earth
4
Deep narrow valley with steep sides
7
Goods brought in from another country
8
Wearing away of land by water or wind
9
Distance east or west of prime meridian
10
Area where water covers the soil
12
Largest river in South America
纵向
2
Land surrounded by water
4
Long-term weather patterns of an area
5
Physical features of land
6
Region surrounding the North Pole
11
Flat grassland in tropical regions