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1、TheYellowstoneParkYellowstoneNationalPark,establishedbytheU.S.CongressandsignedintolawbyPresidentUlyssesS.GrantonMarch1,1872,isanationalparklocatedprimarilyintheU.S.stateofWyoming,althoughitalsoextendsintoMontanaandIdaho.Yellowstone,widelyheldtobethefirstnationalparkintheworld,isknownforitswildli
2、feanditsmanygeothermalfeatures,especiallyOldFaithfulGeyser,oneofthemostpopularfeaturesinthepark.YellowstoneNationalParkspansanareaof3,468.4squaremiles(8,983km2),comprisinglakes,canyons,riversandmountainranges.YellowstoneLakeisoneofthelargesthigh-altitudelakesinNorthAmericaandiscenteredovertheYell
3、owstoneCaldera,thelargestsupervolcanoonthecontinent.Thecalderaisconsideredanactivevolcano.Ithaseruptedwithtremendousforceseveraltimesinthelasttwomillionyears.Halfoftheworld'sgeothermalfeaturesareinYellowstone,fueledbythisongoingvolcanism.Lavaflowsandrocksfromvolcaniceruptionscovermostofthelandare
4、aofYellowstone.GrandCanyonTheGrandCanyonislocatedinthenorthwestoftheStateofArizona,formedbytheColoradoRiveraftermillionsofyearsoferosion,colorfulandsteepcliffs.In1979GrandCanyonwaschosenintheWorldHeritageGrandCanyonSkywalkknownasthe"eighthwonderoftheworld."VisitorsstandingintheGrandCanyonSkywalk,
5、youcanenjoya720degreeangleoftheGrandCanyonspectacle.CarvedintoacorneroftheArizonaplains,thegreatroaringriver,toweringrockformationsandbreathtakingvastnessoftheGrandCanyonserveasamonumenttotheboldandenduringspiritofAmerica.END最后為鼠小莫莫瘋狂打call
