横向
1
Cold treeless Arctic plain
4
Largest ocean on Earth
5
Half of the Earth
8
Imaginary line around the middle of Earth
13
Large body of water partly enclosed by land
纵向
2
Goods brought in from another country
3
Largest hot desert in the world
6
Long-term weather patterns of an area
7
Region surrounding the North Pole
9
Low area between mountains
10
Deep narrow valley with steep sides
11
Large slow-moving mass of ice
12
Dry land with little rainfall