frightening nature（reference for teaching）

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1、Frighteningnature（ReferenceforTeaching）ReferenceforTeaching　　I.异国风情　　1.TheGrandCanyon　　TheGrandCanyon(大峡谷)isconsideredoneofthesevenwondersofthenatural　　world.ItisoneofAmerica’smostfamousnationalparks.Visitorstothecanyoncomefromallpartsoftheworld.Offici

2、alssayabout5millionpeoplevisittheGrandCanyoneachyear.　　Thecanyonextends450kilometers.ButthesurroundingareadoesnotsuggesttheexistenceofsuchalargeopeningintheEarth.Visitorscomeuponthecanyonsuddenly,whentheyreachtheedge.Thentheyarelookingatalandlikenothin

3、gelseintheworld.Wallsofrockfallawaysharply.Insomeplaces，thecanyonwallsaremorethanakilometerdeep.Farbelowisthedark,turninglineoftheColoradoRiver(科罗拉多河).Ontheothersideofthecanyon,sunshinelightsuptherockwallsinred,orangeandgold.Thebrightcolorsaretheresult

4、ofmineralsintherocks.　　Theirappearancechangeswiththelight,thetimeofyearsandtheweather.Atsunset,whenthesunhasmovedacrossthesky,thecanyonwallstakeonquietercolorsofblue,purple(紫色)andgreen.Hundredsofrockypointsrisefromthebottomofthecanyon.Someareverytall.Y

5、etallarebelowthelevelofanobserverontheedge,lookingover.　　ThereareseveralwaystoseetheGrandCanyon．Manyvisitorswalkalongpaths　　downintothecanyon.Ittakesseveralhourstowalktothebottom,ittakestwotimesaslongtowalkbackup．Somevisitorsridemules(骡子)t0thebottomoft

6、hecanyonandback．Mulesarestronganimalsthatlooklikehorses．Theyareknownfortheirabilitytowalkslowlyandsafelyonthepaths．ManypeopleseetheGrandCanyonbyair．Theypayahelicopterorairplanepilottoflythemaboveandaroundthecanyon．OthersseeitfromtheColoradoRiver．Theyri

7、deboatsoverthefastmovingwater．Thesetripscanlastfromoneweektothreeweeks．　　America’sNationalParkServiceisinchargeofprotectingtheGrandCanyonfrom　　theeffectsofsomanyvisitors．Visitorsmustcarrya11wastematerialsoutofthearea．Allrocks．historicalobjects，plantsan

8、dwildlifemustbeleftuntouched．TheNationalParkServicetellsitsvisitors，“Takeonlyphotographs．Leaveonlyfootprints．”　　2．TheBirthofAnIsland　　Surtseywasbornin1963．Itwasagreateventforscientists．Theywereluckyenoughtoseethebirthofthisvolcanicislan