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3、.PresentonEarthinsolid,liquid,andgaseousstates,waterisexceptionallyreactive.Itdissolves,transports,andprecipitatesmanychemicalcompoundsandisconstantlymodifyingthefaceoftheEarth.Evaporatedfromtheoceans,watervaporformsclouds,someofwhicharetransportedbywin
4、doverthecontinents.Condensationfromthecloudsprovidestheessentialagentofcontinentalerosion:rain.Precipitatedontotheground,thewatertricklesdowntoformbrooks,streams,andrivers,constitutingwhatarecalledthehydrographicnetwork.Thisimmensepolarizednetworkchanne
5、lsthewatertowardasinglereceptacle:anocean.Gravitydominatesthisentirestepinthecyclebecausewatertendstominimizeitspotentialenergybyrunningfromhighaltitudestowardthereferencepoint,thatis,sealevel.Therateatwhichamoleculeofwaterpassesthoughthecycleisnotrando
6、mbutisameasureoftherelativesizeofthevariousreservoirs.Ifwedefineresidencetimeastheaveragetimeforawatermoleculetopassthroughoneofthethreereservoirs—atmosphere,continent,andocean—weseethatthetimesareverydifferent.Awatermoleculestays,onaverage,elevendaysin
7、theatmosphere,onehundredyearsonacontinentandfortythousandyearsintheocean.Thislastfigureshowstheimportanceoftheoceanastheprincipalreservoirofthehydrospherebutalsotherapidityofwatertransportonthecontinents.Avastchemicalseparationprocesstakesplacesduringth
8、eflowofwateroverthecontinents.Solubleionssuchascalcium,sodium,potassium,andsomemagnesiumaredissolvedandtransported.Insolubleionssuchasaluminum,iron,andsiliconstaywheretheyareandformthethin,fertileskinofsoilonwhichvegetationcangro
