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1、Astronomy Unit4 thescienceofthestars XingningNo 1MiddleSchool HeZhixin Game1 Whatistheword e r t a h earth Word1 a m m m l mammal a Word2 t m y s e system s Word3 i s x t e exist Game2 Repeatthewords harmful surface depend Whatarethewords Group1 mammal development solarsystem Group2 method reptile v
2、iolent BigBang Group3 planet amphibian explode atmosphere global 1 ManyscientistsbelievethattheuniversebeganwithahugeexplosioncalledtheBigBang Whendidithappen A about1 5billionyearsagoB about15billionyearsagoC about4billionyearsago Haveaquiz 2 Eachreligionorculturehasitsownideasaboutthebeginningofth
3、euniverse Canyougiveoneortwoexamples InChineselegend itsays createdtheworld Heseperatestheskyfromtheearthandhiswhole turnsintoallkindsofthingsintheuniverse Pangu 盘古 body 2 Eachreligionorculturehasitsownideasaboutthebeginningoftheuniverse Canyougiveoneortwoexamples theGod AdamandEve InBible theworlda
4、ndthewholeuniversewascreatedby whocreatedthefirstmanandthefirstwomancalled 3 Whendidtheearthcomeintobeing A about10billionyearsagoB about20billionyearsagoC about4 5billionyearsago4 Whendidlifebeginontheearth A about1billionyearsagoB about2billionyearsagoC about3billionyearsago Haveaquiz ONTHEEARTH H
5、ow LIFEBEGAN Go Go Timeisup scanning Go Go Timeisup CompreheningEx 1 Paragraph1 WhatisthemainideaofPara 1 2 Whywaswaterimportantontheearth Questions Acloudofdust Afterthe BigBang theearthwasjustacloudofenergeticdust Asolidball Whatitwastobecomewasamysteryuntilthedustbegantoslowlycombineintoaballmovi
6、ngaroundthesun Violentearth Theproblemwasthattheearthbecameviolentbecauseitwasnotclearwhetherthesolidshapewastolastornot Itexplodedloudlywithfireandrock Atmosphere Whichwereintimetoproducethewatervapour carbondioxide oxygen nitrogenandothergases whichweretomaketheearth satmosphere Presenceofwater As
7、theearthcooleddown waterbegantoappearonitssurface Nobodyknewthatitwasgoingtobedifferentfromotherplanetsgoingroundthesun Waterstayed WaterhadalreadydisappearedfromplanetslikeMarsorsatelliteslikethemoon butitstayedontheearth Moon Mars special Thisishowtheearthbegantoshowitsspecialqualities Manypeoplet
8、hinkthatthiswasimportantforthebeginningoflife Harmfulgases Itallowedtheearthtodissolveharmfulgases whichhadbecomepartoftheearth satmosphere intotheoceansandseas Possiblelife Thatmadeitpossibleforlifetobegintodevelop Paragraph1 WhatisthemainideaofPara 1 2 Whyiswaterimportantontheearth Questions Ittal
9、ksabouthowwatercameintobeingontheearthanditsimportancetothedevelopmentoflife Becausewaterallowedtheearthtodissolveharmfulgasesintotheoceansandseas Smallplantsgrowonthewater Whatscientiststhinkisthattheearthwasdifferentbecauseofthearrivalofsmallplantsgrowinginthewateronitssurface Oxygen Nobodyunderst
10、oodthattheseplantswerethestartofmanychanges Theymultipliedandfilledfirstoceansandseaswithoxygen Shellfishandotherfishappear Thisencouragedthedevelopmentofearlyshellfishandallsortsoffish Plantsbegantogrowondryland Manymillionsofyearslaterthefirstgreenplantsbegantoappearonland Carbondioxide Scientists
11、believethattakingcarbondioxidefromtheatmosphereandfillingtheairwithoxygenhelpedlifetodevelop Insectsappear Laterlandanimalsappeared Somewereinsects Amphibiansappear Others calledamphibians wereabletoliveonlandaswellasinthesea Reptilesappear Whentheplantsgrewintoforests reptilesappearedforthefirsttim
12、e Theyproducedyounggenerallybylayingeggs Dinosaursappear Later somehugeanimals calleddinosaurs developed Theylaideggstoo Theybecamethemostimportantanimalsontheearthformillionsofyears Mammalsappear Butwhentheydisappeared mammalsbecamemoreimportant Theywerethelastgroupofanimals Produceyoung andtheywer
13、edifferentbecausetheyproducedtheiryoungfromwithintheirbodies 1 Whyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether Bacausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth Questions 2 WhatisthemainideaofPara 2 3 Questions Ittellsussomethingabouttheevolution 进化 process 过程 ofplantsand
14、animals Fillintheblanks 2 3 45 6 789 1smallplantsin andallsortsoffish greenplantson insects dinosaurs water shellfish land amphibians forests reptiles mammals 1acloudofdust Thetimelineofthedevelopmentoflifeontheearth 2asolidball 3presenceofwater 4smallplantsgrowonthewater 5shellfishandotherfishappea
15、r 6plantsbegintogrowondryland 7insectsandamphibiansappear 8reptilesappear 9dinosaursappear 10mammals includinghumans appear Animalswithfourlegsandfeet Smallcleveranimals nowwithhandsandfeet appearedandspreadallovertheearth Humansappear Theydevelopednewmethodsofgrowingfood huntingandmovingaround Asti
16、mewentbytheycoveredtheearthandhavebecomethemostimportantanimalsontheplanet Greenhouseeffect Buttheyarenottakingcareoftheearthverywell Theyareputtingtoomuchcarbondioxideintotheatmosphere whichpreventsheatfromescapingfromtheearthintospace Toohot Theearthmaybecometoohotforthelivesonit future Whetherlifewillcontinueontheearthformillionyearstocomewilldependonwhetherthisproblemcanbesolved Discussion Whatwillourfuturebeiftheearthmaybecometoohotforlivesonit Howtosolve 解决 theproblemofglobalwarming Summar
