横向
1
Distance north or south of equator
4
Largest hot desert in the world
7
Mountain that can erupt with lava
8
Low-lying land surrounded by higher ground
9
Half of the Earth
10
Land surrounded by water on three sides
纵向
2
Deep narrow valley with steep sides
3
Cold treeless Arctic plain
5
Area where water covers the soil
6
Ridge of rock or coral near the surface
11
Largest ocean on Earth