资源描述:
《贝加尔湖畔英语ppt课件.pptx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、LakeBaikaltheworld'soldestanddeepestlakeLakeBaikal,whichtodayislocatednearthecenterofAsia,ismostlikelytheoldestlakeintheworld.Itbeganforming25millionyearsagoasAsiastartedsplittingapartinseriesofgreatfaults.TheBaikalvalleydroppedaway,eventuallyfillingwithwaterandcreatin
2、gthedeepestoftheworld'slakes.LakeBaikalistheworld'slargestanddeepestfreshwaterlake,knownasthe"blueeyesofSiberia"".Typestripisbent,likethecrescentmoon,soitiscalled"MoonLake".Itis636kilometerslong,theaveragewidthof48km,thewidthof79.4kilometers,theareaof31thousandand500sq
3、uarekilometers,withanaveragedepthof744meters,thedeepestpointof1620meters,Lake456metersabovesealevel.Itholdsonone-fifthoftheworld'stotalfreshwater,whichismorethanwaterinspiteofitslessthanimpressiveareabecauseitisbyfartheworld'slake.thetotalofallthewaterinfivegreatlakes;
4、itholdssomuchfreshThereare336riversintotheLakeBaikal.Crescent-shapedlakeBaikal,inSiberia,isonlytheninthlargestlakeinareaat385miles[620km]inlengthand46miles[74km]inwidth,yetitiseasilythelargestbodyoffreshwaterintheworld.Thelakehasavarietyofmarineandplantlife.Inthelaketo
5、thenorthintotheoutletoftheAngarariverthereisahugeboulder,calledthesacredstone.BeautifullegendBaikalwildanimal,asthemostconspicuousofwaterseal.TalkoftheLakeBaikal,thefirstthoughtistheBaikalLakemonster.becausetheLakeBaikalmonster,itcoveredwithalayerofmystery.Andbecauseof
6、theLakeBaikalgenerationage,manyrareanimalslivinginthelake,istheworld’smostendangeredendemicanimalsplantsinLake,thereare848speciesofanimalsandfish.TheLakeBaikalmonsterProblem:wastewaterofpaperpulpisbeingpouredintothelake.Inwinter,thefrozenlaketo1mabovethedepth,for4-5mon
7、ths.But,thetemperatureofthedeepwithinthelakehasremainedthesame,about3.5degreesCelsius.Thankyou