横向
1
Ocean between Americas and Europe/Africa
4
Ridge of rock or coral near the surface
5
Wearing away of land by water or wind
6
Imaginary line around the middle of Earth
9
Largest ocean on Earth
纵向
2
Distance north or south of equator
3
Dry land with little rainfall
7
Region near the equator
8
Flat grassland in tropical regions
10
Chain or group of islands
11
Half of the Earth