how--life-began-on-the-earth公开课PPT课件

.,1,Unit4Astronomy:thescienceofthestars,.,2,Weliveonthesameplanettheearth,.,3,1.Doyouknowtheoriginoflifeonearth?2.Eachreligionorculturehasitsownideasabouthowlifebeganonearth.,.,4,InChineseculture,_separates(分)theskyfromtheearth.,Pangu盘古,sky,earth,.,5,_madehumanbeings.,Nuwa(女娲),.,6,Inwesterncountries:_createdtheworldandalllivingthings.,God(上帝),.,7,Doyouknowwhatascientificideais?,BackgroundknowledgeTheBigBangisthetermusedtodescribeahugeexplosionthatscientistsbelievehappenedabout15billionsyearsago.NobodyknowswhatcausedtheBigBang.Butitwastheeventthatcreatedouruniverse.,TheBigBang,Pre-reading,TheuniversebeganwithaBigBang.,.,8,While-reading,ReadthepassageonP25quickly,andmatchtherightmainideaofeachparagraph.Howmanypartscanthetextbedividedinto?,Step1.Fastreading,Howlifebeganontheearth,.,9,Para.1Para.2Para.3Para.4Para.5,Atheoryabouthowtheuniversewasformed,Theformation(形成）oftheearth,Theimportanceofwaterforlife,Thedevelopmentofplantsandanimals,Thearrivalofhumansandtheireffectsontheearth,Part1:Thedevelopmentoftheearth,Part2:Thedevelopmentoflife.,.,10,(2)DetailedReading,Part1(13):Thedevelopmentoftheearth,.,11,Part1(para13)Thedevelopmentoftheearth,(1)AftertheBigBang,whathappened?(2)Whathappenedtothesolidglobenext?(3)Whatdidthewatervapourandgasesweretomake?(4)Whatappearedaftertheearthcooleddown?(5)Whatdidthewaterdo?,Howdidtheearthcomeintobeing?,.,12,(1)AftertheBigBang,whathappened?,acloudofdust,aviolentsolidball,Settledinto,.,13,explodedwithfireandrock,producedwatervapourandgases,(2)Whathappenedtothesolidglobenext?,Intime,.,14,(3)Whatdidthewatervapourandgasesweretomake?,theearthsatmosphere,.,15,Waterappearedonitssurfacewhichisimportantforthebeginningoflifeontheearth.,(4)Whatappearedaftertheearthcooleddown?,.,16,(5)Whatdidthewaterdo?,Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.,.,17,acloudof_,BigBang,asolid_,slowlycombine,theearth_down,itexplodedloudlywith_and_,water,theearths_,dust,ball/globe,firerock,atmosphere,cooled,Howdidtheearthcomeintobeing(产生）?,.,18,Accordingtothepictures,haveatrytoretellthedevelopmentoflife.,.,19,Acloudofenergeticdust,Asolidball,Atmosphere,Aworldfullofwater,4,1,3,2,dissolveharmfulgases,.,20,Part2(45)Thedevelopmentoflife,.,21,Part2(para45)Thedevelopmentoflife,Readpara4carefullyandmakeatimelineofthedevelopmentoflife,.,22,water,1.,2.,10.,3.,4.insects(onland)5.,6.,7._8.dinosaurs(onland)9._,11.,small_inwater,_andallsortsoffish,greenplantsonland,_(onlandandinwater),forests,(onland),(onland),smallcleveranimalswith_,plants,shellfish,amphibians,reptiles,mammals,handsandfeet,1.atimelineofthedevelopmentoflife,.,23,.,24,.,25,thecleverestanimals,.,26,Thearrivalof_encouragedthe_ofearly_.Manymillionsofyearslater_begantoappear_.Later_appeared.Somewere_.Otherscalled_,wereabletoliveonlandswellas_.Whentheplantsgrewintoforests,_appearedforthefirsttime.Aftertheydisappeared,_becamemoreimportant.Theywerethelastgroupofanimalsdifferentfrombecausethey_milkfromwithintheirbodies.,development,shellfishandallsortsoffish,onland,landanimals,amphibians,dinosaurs,mammals,produced,smallplants,thefirstgreenplants,insects,inthesea,.,27,Readpare5carefully.findouttheanswer.1.Whatproblemiscausedbyhumanbeing?,Theycausedglobalwarming.,.,28,.,29,Step5:discussion,Theearthisgettingwarmereachyear.whateffectswillthishave?Howtosolvethisproblem?,.,30,SuggestedAnswers:Theearthwillbesohotthatnolifewillexist（存在）ontheearthanymore.Tosolvethisproblem,peopleshouldprotecttheearthcarefully.Theymuststopputtingtoomuchcarbondioxideintotheair,reducepollution,controlthe