横向
1
Wearing away of land by water or wind
4
Flat elevated area of land
5
Dry land with little rainfall
7
Goods brought in from another country
8
Mountain that can erupt with lava
9
Land surrounded by water on three sides
12
Largest river in South America
纵向
1
Imaginary line around the middle of Earth
2
Total number of people in an area
3
Distance east or west of prime meridian
6
Large natural elevation of earth
10
Long-term weather patterns of an area
11
Low area between mountains