横向
1
Ridge of rock or coral near the surface
3
Low-lying land surrounded by higher ground
4
Mountain that can erupt with lava
7
Vast body of salt water
8
Large area covered with trees
9
Flat elevated area of land
纵向
2
Wearing away of land by water or wind
5
Region near the equator
5
Region between the two tropic lines
6
Distance east or west of prime meridian