pan geneticpan indudcedpanspapulesparalithic contactparasitismparent materialparent rockparnapartial sterilizationparticle densityparticle sizeparticle size analysisparticle size distributionparticle size summation curveparts per millionpascalpasteurizationpatterned groundpepeatpeat soilpeatlandpebblepebblespebbles coarsepebbles finepebbles mediumpedped shrinkagepedalpedalferpedimentpediplainpedisedimentpedocalpedofeaturepedological featurespedologypedonpedorelictspellety fabricpeneplainpenetrabilitypenetration resistancepenetrometerpercent base saturationpercolation soil waterpereglicperiglacial