横向
1
Large area covered with trees
3
Flat grassland in tropical regions
7
Largest hot desert in the world
8
Region near the equator
9
Cold treeless Arctic plain
11
Mountain that can erupt with lava
13
Ridge of rock or coral near the surface
纵向
2
Land surrounded by water
4
Deep narrow valley with steep sides
5
Largest river in South America
6
Distance east or west of prime meridian
10
Visual representation of an area
12
Half of the Earth