narrower concept bog Concept cohesionless soil Concept cohesive soil Concept consolidation Concept depth influence Concept erosion protection Concept eruption Concept fabric Concept fissure Concept frozen ground Concept loamy soil Concept loess Concept mining subsidence area Concept overconsolidation Concept peat soil Concept permafrost soil Concept seabed Concept silt Concept soil characteristic Concept soil investigation Concept soil type Concept