横向
1
Low-lying land surrounded by higher ground
3
Body of water surrounded by land
4
Goods brought in from another country
6
Deep narrow valley with steep sides
8
Ridge of rock or coral near the surface
9
Largest hot desert in the world
10
Total number of people in an area
纵向
2
Ocean between Americas and Europe/Africa
5
Seasonal heavy rainfall
7
Largest ocean on Earth
11
Large natural elevation of earth
12
Largest river in South America
13
Physical features of land
14
Where river meets the sea