横向
1
Large area covered with trees
5
Imaginary line around the middle of Earth
6
Deep narrow valley with steep sides
7
Height above sea level
8
Largest ocean on Earth
9
Region surrounding the North Pole
纵向
2
Seasonal heavy rainfall
3
Distance north or south of equator
4
Landform where river meets the sea
10
Cold treeless Arctic plain
11
Ridge of rock or coral near the surface
12
Half of the Earth