Unit_4_Astronomy_the_science_of_the_stars公开课课件

Unit4Astronomy:thescienceofthestarsAstronomyisthescientificstudyoftheuniverseandtheheavenbodies(suchasthesun,themoon,andstars),gas,anddustwithinit.astronomersolarsystem•eightplanets•manycomets•otherobjectsWhataretheEnglishnamesoftheeightplanetsthatcircleoursun?海王星Neptune水星Mercury金星Venus地球Earth火星Mars木星Jupiter土星Saturn天王星UranusPre-reading2.Eachreligionandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?InChina,weallknowthatPanguseparatestheskyfromtheearth.PanguseparatestheskyfromtheearthTheGoddessNuwamendedtheheavenandcreatedhumanbeingsfromtheclay(粘土).Day1:GodspokeandseparatedlightfromdarknesscreatingDayandNightDay2:GodspokeandseparatedthewatercreatingskyandoceanDay3:GodspokeandcreateddrylandDay4:Godspokeandcreatedthesun,moonandstarsDay5:GodspokeandcreatedlivingcreaturesintheairandseaDay6:GodspokeandcreatedthelandanimalsandmanDay7:GodrestedandblessedthisdaycallingitHolyGodcreatedtheworldinsevendays:Day4:Godspokeandcreatedthesun,moonandstarsDay5:GodspokeandcreatedlivingcreaturesintheairandseaDay6:GodspokeandcreatedthelandanimalsandmanDay7:GodrestedandblessedthisdaycallingitHolyHowLifeBeganontheEarthThistextcanmainlydividedintotwostages:Stage1:ThedevelopmentoftheearthStage2:Thedevelopmentoflife(para1—3)(para4—5)Readingforstructure:Readingforinformation:Para11.Whatisthewidelyacceptedtheory?ABigBangthatthrewmatterinalldirections.2.Whathashappenedafterthat?Atomsbegantoformandcombinetocreatestarsandotherbodies.ABigBangatomstarsReadingforinformation:Para2ForseveralmillionyearsaftertheBigBang...acloudofdustbetween4.5and3.8yearsagoasolidglobeitexplodedwithfireandrockcarbondioxidenitrogenwatervapour...othergasesmaketheearth'satmosphereWhat'sevenmoreimportant?Theearthcooleddownandwaterbegantoappearonitssurface.Readingforinformation:Para3Waterappearedonthe_______,besidesthat,waterhadalsoappearedonotherplanetslike_____,butithad__________later.earthMarsdisappearedWhatarolethewaterplayedinthedevelopmentoflife?Thepresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.ThisproduceachainreactionwhichmadeitpossibleforlifetodevelopStage2ThedevelopmentoflifeReadingforinformation:Para4-5Makeatimelineofthedevelopmentoflife:ertremelysmallplantsappearsinwaterShellfishandallsortsoffishgreenplantsbegantogrowonlandlandanimals:insects&hibiansforestsreptilesappeareddinosaurtheriseofmammalssmallcleveranimalswithhandsandfeetReadingforinformation:Para4-51.Whoarethesmallcleveranimalswithhandsandfeet?2.Aretheytakingcareoftheearthwell?Why?Becausetheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.HumanBeingsTheearthbecametoohottoliveon1.Retellthepassageaccordingtotheform.2.Supposeyouweretheearth,whatwouldyouadvisehumanstodo?Writealettertothehumanbeing.