soil layer with concentrated root

soil layer with deep deposit

2-layer soil

a finite soil layer

Active soil layer

annular soil layer

Backfill soil layer

bare soil and soil with crop

black thin-layer soil

calcareous soil with low concentration available P

Cavities in soil layer

Clay-layer soil

coarse-grained soil with weak rock

cohesive clay-layer soil of riverbank

cohesive soil with calcareous nodules

Cohesive Soil with High Liquid Limit

compound wall with soil nails

conduit hidden by filling with soil

constitution of soil layer