横向
1
Region surrounding the North Pole
4
Flat grassland in tropical regions
6
Ocean between Americas and Europe/Africa
7
Landform where river meets the sea
8
Half of the Earth
9
Dry land with little rainfall
纵向
2
Largest hot desert in the world
3
Low-lying land surrounded by higher ground
5
One of seven major landmasses
10
Wearing away of land by water or wind
11
Where river meets the sea
12
Largest river in South America