packing, pahoehoe, paleokarst, paleokarstic surface, paleomagnetism, paleontology, palette, palygorskite, pan coefficient, panhole, paragenesis, paragenetic cave, parahopeite, paraphreatic, parent material, parietal fauna, park, particle, particulate transport, parting, partition, partitioning function, parts per million, passage, pathogenic bacteria, pavement, pearl, peat, pebble, Peclet number, pediment, pellicular water, peloid, pelsparite, pen trace, pendant, rock pendant, pendular regime, pendulite, peneplain, pepino hill, percent saturation, perched ground water, perched karst spring, perched water table, percolate, percolation water, percolation; percolation water, perennial spring, perennial yield, perforation, periodic spring, permafrost, permafrost karst, permafrost table, permanent hardness, permanent wilting point, permeability, permeability barrier, permeability coefficient, permeability tensor, permeability, effective, permeability, intrinsic, permeability, relative, permeability, specific, permeability, transverse, permeameter, pervious, petrography, pH, phonolite, photogeology, photogrammetry, photosynthesis, phreas, dynamic, phreas, phreatic water, phreatic cave, phreatic decline, phreatic fluctuation, phreatic lift, phreatic line, phreatic rise, phreatic surface, phreatic water, phreatic zone, phreatobia, phreatobite, phreatophyte, physiography, phytometer, piedmont plain, piezometer, piezometric head, piezometric limit, piezometric surface, pigment, pillar, pinnacle karst, pinnacles, pipe, piping, pisanite, pisolite, pisolith, pit, pitch, piton, pitot tube, pitted plain, plan, planarian, plane of weakness, planimeter, plateau, Pleistocene, plunge pool, pocket, pocket storage, pocket valley, podzol, point of inflection, point source, point-bar deposit, poise, pokryty karst, polarization, polje, pollutant or contaminant, polluted water, pollution, pollution abatement, polygonal karst, pond, ponded water, ponor, ponornica, pool deposit, population, pore, pore deposit, pore entry radius, pore pressure, pore space, pore velocity, porosimeter, porosity, porosity, absolute, porosity, effective, porosity, primary, porosity, secondary, porosity, tertiary, porous, porous medium, porthole, potable water, potamology, potential, potential density, potential drop, potential evapotranspiration, potential flow, potentiometer, potentiometric field, potentiometric surface, pothole, potholer, potholing, pozo, preadapted, precipitation, precipitation excess, precipitation gage, predator, pressure, pressure cell, pressure cell, pressure flow tube, pressure head, pressure, hydrostatic, prey, prism storage, prismatic compass, probe, producers, projected section, proto-cave, prusik knot, prusik sling, prusiking, pseudo-breccia, pseudokarren, pseudokarst, psychrometer, puddle, pumping test, pupa, pycnometer, pyrite, pyrrhotite, quagmire, quartz, quiet reach,