Waterpollution Itcovers71%oftheearth'ssurfaceandmakesup65%,lifeonEarthwouldbenon-existentWaterisEssentialforLife %ofthewateronEarth,though,isseawater‑%ofthewaterisfrozeninthepolaricecaps,leavinglessthan1%:,’,nitrogen,,lightningcausesnitrogen,oxygen,,(cations)innaturalwateraresodium(Na+),potassium(K+),calcium(Ca2+),magnesium(Mg2+),andsometimesiron(Fe2+orFe3+).Thenegativeions(anions)areusuallysulfate(SO42-),bicarbonate(HCO3-),andchloride(Cl-).hardwaterWatercontainingthesecalcium,magnesium, Waterpollutionisanychemical,physicalorbiologicalchangeinthequalityofwaterthathasaharmfuleffectonanylivingthingWaterpollutioncausedbyhumanactivitiesisalargesetofadverseeffectsuponwaterbodiessuchaslakes,rivers,oceans,andgroundwaterPollutantsinwaterincludeawideofchemicals,pathogens病原体,,ountsforthedeathsofmorethan14,,poisonousfoodanimals,unbalancedriverandlakeecosystems,deforestationandmanyothereffects
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