横向
1
Chain or group of islands
7
Wearing away of land by water or wind
8
Ridge of rock or coral near the surface
9
Height above sea level
11
Deep narrow valley with steep sides
纵向
2
Largest ocean on Earth
3
Physical features of land
4
Mountain that can erupt with lava
5
Raised area of land, smaller than a mountain
6
Large area covered with trees
10
Largest river in South America