横向
1
Region surrounding the North Pole
4
Wearing away of land by water or wind
5
Area where water covers the soil
8
Largest river in South America
10
Goods sold to another country
纵向
2
Mountain that can erupt with lava
3
Large area covered with trees
6
Low area between mountains
7
Piece of land jutting into the sea
9
Ocean between Americas and Europe/Africa
10
Imaginary line around the middle of Earth
11
Long-term weather patterns of an area