横向
1
Large area covered with trees
4
Wearing away of land by water or wind
5
Mountain that can erupt with lava
6
Ocean between Americas and Europe/Africa
8
Low-lying land surrounded by higher ground
纵向
2
One of seven major landmasses
3
Largest hot desert in the world
7
Land surrounded by water on three sides
9
Imaginary line around the middle of Earth
10
Goods sold to another country
11
Total number of people in an area
12
Deep narrow valley with steep sides
13
Physical features of land