横向
1
Deep narrow valley with steep sides
5
Largest river in South America
6
Piece of land jutting into the sea
7
Region surrounding the North Pole
8
Large area covered with trees
9
Large natural elevation of earth
10
Height above sea level
12
Half of the Earth
纵向
2
Distance east or west of prime meridian
3
Physical features of land
4
Vast body of salt water
11
Wearing away of land by water or wind