横向
1
Half of the Earth
3
Cold treeless Arctic plain
7
One of seven major landmasses
8
Goods sold to another country
9
Large area covered with trees
纵向
2
Distance east or west of prime meridian
3
Physical features of land
4
Dry land with little rainfall
5
Largest ocean on Earth
6
Large natural stream of water
10
Total number of people in an area