横向
1
Half of the Earth
6
Largest river in South America
7
Flat grassland in tropical regions
8
Cold treeless Arctic plain
9
Physical features of land
10
Imaginary line around the middle of Earth
纵向
2
One of seven major landmasses
3
Large natural stream of water
4
Wearing away of land by water or wind
5
Distance north or south of equator
11
Total number of people in an area
12
Chain or group of islands