B-horizon, backflooding, background noise, backwater, backwater curve, bacon, bacteria, bactericide, bailer, bailing line, balcony, bank, bank erosion, bank storage, barbels, bare karst, barite, barograph, barometer, barometric efficiency, barrier, barrier spring, barrier, freshwater, barrier, hydrologic, barrier, permeability, base exchange, base flow, base level, base level of erosion, base level, karst, base line, base of karstification, base width, baseline monitoring, basin, basin characteristics, basin method, basin mouth, basin perimeter, basin relief, maximum, basin, closed, basin, drainage, basin, experimental, basin, ground-water, basin, infiltration, basin, intermontane, basin, settling, bat, bathometer, bathybenthic, bathypelagic, bathyphreatic, bathyphreatic zone, beach, beachrock, bearing, bed, bed load, bed roughness, bed, lower confining, bed, marker, bed, mortar, bed, river, bed, stream, bed, upper confining, bedding, bedding cave, bedding grike, bedding joint, bedding plane, bedding-plane cave, bedding-plane parting, bedeckter karst, bedload, bedrock, belay, bench mark, bend, bentonite, beudantite, bicarbonate, bifurcation, bifurcation ratio, biological clock, biomass, biomicrite, biospeleology, biphosphammite, birnessite, blade, blanket, blind chimney, blind shaft, blind valley, bloedite, blowhole, blowing cave, blowing well, blowout, blue hole, bobbin, Bodenbedeckter karst, bog, bogaz, boiling spring, bollard, bolt, bone cave, bone-breccia, borehole, botryoid, botryoidal speleothem, bottom hole, bottomland, boulder clay, boundary spring, bourne, boxwork, brackish water, braided stream, brake bar, branchwork cave pattern, breakdown, breakthrough, breakthrough curve, breakthrough time, breathing cave, breathing hole, breccia, bridge, bridging effect, brine, brittle deformation, brochantite, brushite, bubble gage, bucket, buffered solution, buildup, buried karst, buried valley, burst,