探究式教学Unit 4 人教版）

本课时编写 蚌埠二中马爱军老师 stars supermoon thebigbang theblackhole Warmingup Whatdoyouknowaboutastronomy Astronomyisasciencethatstudiescelestialobjectssuchasplanets moons stars comets nebulae 星云 galaxies SolarSystem What sthis Doyouknowanythingaboutthesolarsystem star恒星 planet行星 Whichisastar Whichisaplanet Whatarethenamesoftheeightplanetsthatcirclethesun 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Uranus solarsystem ScientistsnowthinkPlutoistoosmalltobecalledaplanet Q DoyouknowwhyPlutoisnolongerconsideredaplanet Q Sofar lifehasn tbeendiscoveredonotherplanets Whyistheearthdifferentfromthem HowdoestheSunproduceenergy IsthereintelligentlifeintheUniverse Whatdoweknowaboutplanetsaroundotherstars WhatistheeventualfateoftheSun WheremightwefindlifeintheSolarSystem Whatdeterminesthesurfacetemperatureofaplanet Possibleanswers Whatinterestsyouinastronomy Doyouknowanyquestionsthatastronomersareinterestedin Somefactsaboutastronomy Wecanonlydetectabout5 ofthematterintheuniverse TheSun scorereleasestheequivalentof100billionnuclearbombseverysecond Lightfromdistantstarsandgalaxiestakessolongtoreachusthatweareactuallyseeingtheseobjectsastheyappearedinthepast Shootingstars 流星 reallyaren tstars Theyareusuallyjusttinydustparticlesfallingthroughouratmosphere EventhoughMercuryistheclosestplanettotheSun temperaturestherecanreach 280degreesFonitssurface Earthistheonlyplanetnotnamedafteragod AQuizGame 1 Howoldistheearth A About3 5billionyearsB About4 5billionyearsC About5 5billionyearsD About6 5billionyears2 oftheearthsurfaceiscoveredbywater A 20 B 30 C 50 D 70 Let sturntotheEarth theplanetweshouldknowwell Nowdoaquiztoseehowmuchyouknowaboutourplanet theEarth 3 HowmanyplanetsarethereintheSolarSystem A 6B 7C 8D 94 Whatisthetotalpopulationofhumansontheearth A About3 5billionB About4 5billionC About5 5billionD About6 5billion 5 Howlongdoestherotation 自转 oftheearthtake A 12hoursB 24hoursC amonthD 365days6 Whichcontinentisthesmallest A AfricaB NorthAmericaC SouthAmericaD Oceania7 OnwhatdayistheEarthdaycelebrated A April22B May4C August21D November11 8 Whichoceanisthelargest A ThePacificOceanB TheArcticOceanC TheIndianOceanD TheAtlanticOcean9 Whichcountryhasthelargestarea A CanadaB ChinaC RussiaD U S A Brainstorm头脑风暴 启发思考 Theoriginoflifeonearthisaquestionthatinterestsastronomers Whatdoyouknowaboutit Eachreligionandculturehasitsownideasabouthowlifebeganonearth Whatdoyouknow Panguseparatestheskyfromtheearth ChineseVersion1 Nvwamadehumans ChineseVersion2 TheBiblicalAccount WesternVersion Day1 GodspokeandseparatedlightfromdarknesscreatingDayandNight Day2 Godspokeandseparatedthewatercreatingskyandocean Day3 Godspokeandcreateddryland Day4 Godspokeandcreatedthesun moonandstars Day5 Godspokeandcreatedlivingcreaturesintheairandsea Day6 Godspokeandcreatedthelandanimalsandman Day7 GodrestedandblessedthisdaycallingitHoly IndianVersion Brahma theHindugodofcreation Heisthecreatoroftheuniverseandalllivingbeingsaresaidtohaveevolvedfromhim Prediction Lookatthepictures Doyouknowthetopicofthisunit 海洋里的细胞开始分裂 登陆 爬行动物 恐龙 Mammals Thedevelopmentofhumanbeings Theydevelopednewmethodsofgrowingfood huntingandmovingaround Astimewentbytheycoveredtheearthandhavebecomethemostimportantanimalsontheplanet Readthetextquicklyandfillintheblanks Thetextmainlytellsustheformationofthe andthedevelopmentof onit earth life Skimming 1 自主或小组探究 1 Whatisthemainideaofthetext 2 Whichparagrapharethequestionsmentionedin 1 Howoldistheearth 2 Howdoestheuniversebegin 3 IsthereanywaterintheMars 4 Whendiddinosaursdisappear 5 Whichanimalisthemostimportantoneontheearth Para 4 Para 2 Para 3 Para 5 Para 1 Howlifebeganontheearth Answerthequestionsaccordingtothetext Beforelifeappeared Para 3 theimportanceofwaterforlife Para 1 awidelyacceptedtheoryabouttheformationoftheuniverse Para 2 theformationoftheearth Thedevelopmentoflife Para 4 thedevelopmentofplantsandanimalsontheearth Para 5 thearrivalofhumansandtheirimpactontheearth Shellfish fish Plantsonland amphibians Forests Reptiles Dinosaurs Mammals Landanimals SmallPlantsinthewater Insects Para 4 thedevelopmentofplantsandanimalsontheearth 1 Whendidthe BigBang happen Ithappenedseveralbillionyearsago 2 Whatformwastheearthafterthe BigBang Theearthwasstilljustacloudofdust Readthepassagequicklyandanswerthequestions Scanning 2 3 Whatmadeuptheearth satmosphereaftertheearthexploded Carbondioxide nitrogen watervapourandothergases 4 Howdidwatercomeintobeingontheearth Astheearthcooleddownafteritexploded watercameintobeing 5 What sthesignificanceofthepresenceofwaterontheearth Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas 6 Whatwasimportanttothedevelopmentoffish oxygen 7 Whatmadepossibletheriseofmammalsontheearth Thedisappearanceofdinosaursmadepossibletheriseofmammalsontheearth 8 Whyaremammalsdifferentfromalllifeformsinthepast Theygavebirthtoyoungbabyanimalsandproducedmilktofeedthem 3 Readthepassagecarefullyandfillintheblanks Atoms Detailedreading violent atmosphere presence acids oxygen shellfish amphibians clever dioxide Howlifebeganontheearth BigBang otherbodies stars Earth acloudof atoms dust 4 Post reading asolid theearth s other Water tothedevelopmentoflife watervapour nitrogen carbon extremelysmall onthesurfaceofthewater globe gases atmosphere fundamental plants early andallsortsoffish greenplantsonland landanimals insects amphibians hugeanimals dinosaurs theriseof humanbeings shellfish reptiles mammals Thinkaboutwhatyouhavereadanddiscussthesequestionsinpairs 1 Whywastheearthdifferentfromotherplanets Becausethewaterremainedontheearth 2 Whydidtheplantsgrowbeforetheanimalscame Becauseplantsprovideoxygenforanimalstobreathe 5 Discussion 3 Whyisitwrongtoshowfilmswithdinosaursandpeopletogether Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth 4 Thereusedtobenineplanetsinthesolarsystem Recentlyscientistshavedecidedthatoneofthemcannolongerbeconsideredaplanet Doyouknowthenameofthatplanet Doyouknowwhytheyremovedit ThenameisPluto Scientistsnowthinkitistoosmalltobecalledaplanet 5 Whatproblemiscausedbyhumanbeings Humanbeingscausedglobalwarming Wehaveonlyoneearth Wearemakingtheworldbetter Wearemakingtheworldworse A B Discussion1 协作交流 developednewmethodsofgrowingfood 1 Whathumansdeveloped developednewmethodsofhunting developednewmethodsofmovingaround 2 Buttheyarenottakingcareoftheearthverywell Whatproblemarehumanscausing puttingcarbondioxideintotheatmosphere theearthmaybecometoohot Asastudent whatlittlethingscanwedofortheearth GroupWork Discussion2 DesignanactivityonEarthDay WhattheactivityisaboutWhytheactivityisdesignedWhenandwheretodotheactivityWhotakespartintheactivityWhattobedoneintheactivity Let stakepartintheactivitiestosavetheearth Usethefollowingwordsorphrasestohelpyou prevent from harmfulglobalwarmingcarbondioxideinturndependonasaresultatmosphere solarenergy planttrees recyclerubbish preventdesertification savewater purifyair Afterthe bigbang theearthwasstilljustacloudof it loudlywithfireandrock whichwere toproducethe watervapourandothergases Then begantoappearedontheearth inwaterareconsideredtobetheearliestlivesontheearth TheO2theysuppliedencouragedthelivesof Slowlygreenplantsgrewonland whichwerefollowe