横向
1
Low-lying land surrounded by higher ground
3
Largest hot desert in the world
4
Dry land with little rainfall
6
Long-term weather patterns of an area
8
Large natural elevation of earth
10
One of seven major landmasses
纵向
2
Where river meets the sea
5
Area where water covers the soil
7
Largest ocean on Earth
9
Imaginary line around the middle of Earth
11
Deep narrow valley with steep sides