美国黄石国家公园english

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1、YellowstoneNationalPark,setasidebytheU.S.CongressasanationalparkonMarch1,1872,islocatedmostlyintheU.S.stateofWyoming（美国怀俄明州）,thoughitalsoextendsintoMontana）蒙大纳（美国州名））andIdaho（爱达荷).Theparkwasthefirstofitskind,andisknownforitswildlifeanditsmanygeothermal（地热的）features,especiallyOldFaithfulGeyser(喷

2、泉),oneofthemostpopularareasinthepark.Ithasmanytypesofecosystems,butthesubalpine（亚高山带）forestisdominant.OldFaithfulshowsthatrocksbelowthesurfaceareveryhot.Rocksbelowgroundheatthewaterunderpressureforaround90minutes.Suddenly,somewaterspurtsthroughatiny5-inchwidecrackintherocks.Thiscausesadropinthe

3、pressurewithinthewaterchamber.Inaninstant,thousandsofgallonsofwaterareturnedtosteamandblastedupintotheair.PavedroadsprovidecloseaccesstothemajorgeothermalareasaswellassomeofthelakesandwaterfallsYellowstoneLakeisoneofthelargesthigh-altitudeThecaldera(火山喷口)isconsideredanactivevolcano,ithaserupted

4、withtremendousforceseveraltimesinthelasttwomillionyearsGrizzlies,wolves,andfree-rangingherdsofbisonandelkliveinthepark.Yellowstonehasnumerousrecreationalopportunities,includinghiking,camping,boating,fishingandsightseeing.