横向
1
Ridge of rock or coral near the surface
4
Flat grassland in tropical regions
6
Region surrounding the North Pole
7
Mountain that can erupt with lava
8
Steep rock face at edge of land
9
Area where water covers the soil
纵向
2
Largest ocean on Earth
3
Goods brought in from another country
5
Landform where river meets the sea
7
Low area between mountains
10
Height above sea level