WaterpollutionaterisessentialforlifeItcovers71%oftheearth'ssurfaceandmakesup65%%ofthewateronEarth,though,isseawater-,leavinglessthan1%availableasfreshwaterWater:,'tAllH20Rainwatercarriesdustparticlesfromtheatmospheretothegroundrainwateralsodissolvesalittleoxygen,nitrogen,,oXygen,(cations)innaturalwateraresodium(Na+),potassium(K+),calciumCa2+),magnesium(Mg2+),andsometimesiron(Fe2+orFe3+.Thenegativeions(anionsareusuallysulfates042-bicarbonate(HCo3-andchloride(cl)hardwaterWatercontainingthesecalciummagnesium,andironionsiscalledhardwaterThepositiveionsreactwiththenegativeionsinsoaptoformascumthatclingstoclothesandleavesthemdingylookingWaterpollutionWaterpollutionisanychemical,physicalorbiologicalchangeinthequalityofwaterthathasaharmfuleffectonanylivingthingWaterpollutioncausedbyhumanactivitiesisalargesetofadverseeffectsuponwaterbodiessuchaslakes,rivers,oceans,andgroundwaterPollutantsinwaterincludeawideofchemicals,pathogens病原体,ountsforthedeathsofmorethan14,000peopledailyEffectsofwaterpollutionincludepoisonousdrinkingwater,poisonousfoodanimals,munityiscalledwastewater,
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