横向
1
Imaginary line around the middle of Earth
5
Largest ocean on Earth
6
Line dividing two countries
8
Total number of people in an area
9
Dry land with little rainfall
10
Low area between mountains
纵向
2
Large natural stream of water
3
Ridge of rock or coral near the surface
4
Deep narrow valley with steep sides
7
Distance east or west of prime meridian
11
Region near the equator
12
Height above sea level