横向
1
Distance north or south of equator
5
Wearing away of land by water or wind
6
Largest river in South America
7
Largest ocean on Earth
8
Body of water surrounded by land
10
Mountain that can erupt with lava
11
Height above sea level
纵向
1
Distance east or west of prime meridian
2
Cold treeless Arctic plain
3
Vast body of salt water
4
Region near the equator
9
Ridge of rock or coral near the surface
12
Large area covered with trees