unsaturated soil landslide

Black soil zone

Black soil zone in northeast of China

black soil zone of Songnen plain

Brown soil zone

clear zone zone

Perennially Frozen Soil Zone

root zone soil

Root zone soil mixture

slide zone soil

Sliding Zone Soil

soil zone

subgrade in permafrost soil zone

the northeastern black soil zone

unsaturated zone soil

unsaturated zone soil layer in field

soil-soil

the alternative occurrence of fractured zone and non-fractured zone

trade-wind zone [= zone of trade wind]