横向
1
Largest ocean on Earth
5
Region surrounding the North Pole
6
Distance north or south of equator
8
Largest river in South America
纵向
2
Wearing away of land by water or wind
3
Physical features of land
4
Total number of people in an area
7
Ocean between Americas and Europe/Africa
9
Steep rock face at edge of land
10
Where river meets the sea