横向
1
Deep narrow valley with steep sides
2
Largest ocean on Earth
3
Region surrounding the North Pole
5
Raised area of land, smaller than a mountain
7
Largest river in South America
8
Distance north or south of equator
纵向
1
One of seven major landmasses
2
Land surrounded by water on three sides
4
Low-lying land surrounded by higher ground
6
Large natural elevation of earth