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Theatmosphereisohecrucialpartsoftheenviro.ItisayerofgasesthatsurroundstheEarth，mainlyposedofnitrogenabout78％，oxygenabout21％，andsmallamountsofasessuchascarbondioxide，argon，andtraceamountsofneon，helium，ahaheatmosphereprotectsusfromharmfulsorradiatiutestheEarth，stemperature，andprovidestheairwebreathe.Forexample，theozohiratospherepysavitalroleinabsmostoftheSun，sultravioletradiation，whichcauseskindotherhealthproblemsifitreachestheEarth，ssurfargeamounts.

Thehydrosphereincludesallthewateroh，ssurface，suchasos，seas，kes，rivers，andgroundwater.Oscoverabout71％oftheEarth，ssurfadarehometoanincrediblydiverserangeofmarinelife.Theyalsopyasignifitroleiingtheglobalclimatethroughprocessesliketheabsorptionandreleaseofheat.Riversandkesareimportantsourcesoffreshwaterfordrinking，irrigation，andindustry.Groundwater，storedbehtheEarth，ssurfaaquifers，isaalwaterr

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