横向
1
Total number of people in an area
4
Distance north or south of equator
7
Land surrounded by water on three sides
9
Deep narrow valley with steep sides
纵向
2
Large slow-moving mass of ice
3
Where river meets the sea
5
Large natural elevation of earth
6
Low-lying land surrounded by higher ground
8
Wearing away of land by water or wind
10
Vast body of salt water
11
Distance east or west of prime meridian