soil and sediment deposited by a river are usually high / rich in nutrients
sediment is soil. fat_clay is high_plasticity_soil_region. sedimentary_clay is soil. fat_clay is not high_plasticity_soil_region. sedimentary_clay is not soil. indurated_clay is not soil. indurated_clay is soil. high_plasticity_soil_region is not fine_grained_soil_region. heavy_water_production_plant is tangible_thing. sediment is not soil.