横向
1
Ridge of rock or coral near the surface
3
Total number of people in an area
5
Land surrounded by water
6
Height above sea level
9
Dry land with little rainfall
纵向
2
Large area covered with trees
3
Largest ocean on Earth
4
Wearing away of land by water or wind
7
Raised area of land, smaller than a mountain
8
Distance east or west of prime meridian
10
Region surrounding the North Pole