横向
1
Largest river in South America
5
Imaginary line around the middle of Earth
6
Seasonal heavy rainfall
7
Large natural elevation of earth
10
Wearing away of land by water or wind
纵向
2
Vast body of salt water
3
Large area covered with trees
4
Physical features of land
8
Narrow sea inlet between cliffs
9
One of seven major landmasses
11
Distance east or west of prime meridian