横向
1
Imaginary line around the middle of Earth
5
Distance east or west of prime meridian
6
Goods brought in from another country
7
Wearing away of land by water or wind
9
Flat grassland in tropical regions
12
Largest river in South America
纵向
2
Total number of people in an area
3
Region between the two tropic lines
4
Landform where river meets the sea
8
Mountain that can erupt with lava
10
Half of the Earth
11
Seasonal heavy rainfall
13
Body of water surrounded by land