soil and sediment deposited by a river are usually high / rich in nutrients
clay is soil. sediment is soil. sedimentary_clay is soil. indurated_clay is soil. sand is plentifull. heavy_water_production_plant is tangible_thing. sediment is solid_ground. high_plasticity_soil_region is fine_grained_soil_region. fat_clay is high_plasticity_soil_region. clay_soil is soil.