横向
1
Distance east or west of prime meridian
3
Where river meets the sea
5
Region near the equator
6
Total number of people in an area
7
Low-lying land surrounded by higher ground
8
Seasonal heavy rainfall
10
Goods brought in from another country
纵向
2
Area where water covers the soil
3
Goods sold to another country
4
One of seven major landmasses
9
Deep narrow valley with steep sides
11
Land surrounded by water
12
Flat grassland in tropical regions
13
Wearing away of land by water or wind