横向
1
Region between the two tropic lines
5
Mountain that can erupt with lava
6
Large natural stream of water
9
Wearing away of land by water or wind
纵向
2
Where river meets the sea
3
Distance north or south of equator
4
Seasonal heavy rainfall
7
Largest ocean on Earth
8
Large natural elevation of earth
10
Area where water covers the soil
11
Region surrounding the North Pole