横向
1
Land surrounded by water on three sides
5
Wearing away of land by water or wind
6
Area where water covers the soil
7
Long-term weather patterns of an area
9
Line dividing two countries
11
One of seven major landmasses
13
Largest hot desert in the world
纵向
1
Total number of people in an area
2
Seasonal heavy rainfall
3
Deep narrow valley with steep sides
4
Large natural elevation of earth
5
Imaginary line around the middle of Earth
8
Largest ocean on Earth
10
Half of the Earth
12
Flat grassland in tropical regions