横向
1
Cold treeless Arctic plain
4
Mountain that can erupt with lava
5
Region between the two tropic lines
6
Wearing away of land by water or wind
10
Physical features of land
12
Where river meets the sea
13
Distance east or west of prime meridian
纵向
2
Deep narrow valley with steep sides
3
Half of the Earth
7
Flat elevated area of land
8
Dry land with little rainfall
9
Long-term weather patterns of an area
11
Region near the equator