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1、astronomy:astronomy:Unit 4Unit 4the science of the starsthe science of the starsXingning No.1 Middle School:He ZhixinXingning No.1 Middle School:He Zhixin2021/8/11 星期三1Game 1:What is the word What is the word?ertahearth2021/8/11 星期三2Word 1:ammmlmammala2021/8/11 星期三3Word 2:tmysesystems2021/8/11 星期三4W
2、ord 3:isxteexist2021/8/11 星期三5 Game 2:Repeat the wordsharmfulsurfacedependWhat are the words?2021/8/11 星期三6 Group 1:mammaldevelopmentsolar system2021/8/11 星期三7 Group 2:methodreptileviolentBig Bang2021/8/11 星期三8 Group 3:planetamphibianexplodeatmosphereglobal2021/8/11 星期三91.Many scientists believe tha
3、t the universe began with a huge explosion called the Big Bang.When did it happen?A.about 1.5 billion years ago B.about 15 billion years ago C.about 4 billion years ago Have a quiz 2021/8/11 星期三102.Each religion or culture has its own ideas about the beginning of the universe.Can you give one or two
4、 examples?In Chinese legend,it says _created the world.He seperates the sky from the earth and his whole _ turnsinto all kinds of things in the universe.Pangu（盘古）body2021/8/11 星期三112.Each religion or culture has its own ideas about the beginning of the universe.Can you give one or two examples?the G
5、odAdam and EveIn Bible,the world and the whole universe was created by _,who createdthe first man and the first woman called _.2021/8/11 星期三123.When did the earth come into being?A.about 10 billion years ago B.about 20 billion years ago C.about 4.5 billion years ago 4.When did life begin on the eart
6、h?A.about 1 billion years ago B.about 2 billion years ago C.about 3 billion years agoHave a quiz 2021/8/11 星期三13 ON THE EARTHHowLIFE BEGAN?2021/8/11 星期三14Go!Go!Time is up!scanning2021/8/11 星期三15Go!Go!Time is up!comprehening ex.12021/8/11 星期三16Paragraph 11)What is the main idea of Para.1?2)Why was wa
7、ter important on the earth?Questions2021/8/11 星期三17A cloud of dustAfter the“Big Bang”,the earth was just a cloud of energetic dust.2021/8/11 星期三18A solid ballWhat it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.2021/8/11 星期三19Violent earth The
8、problem was that the earth became violent because it was not clear whether the solid shape was to last or not.It exploded loudly with fire and rock,2021/8/11 星期三20AtmosphereWhich were in time to produce the water vapour,carbon dioxide,oxygen,nitrogen and other gases,which were to make the earths atm
9、osphere.2021/8/11 星期三21Presence of waterAs the earth cooled down,water began to appear on its surface.Nobody knew that it was going to be different from other planets going round the sun.2021/8/11 星期三22Water stayedWater had already disappeared from planets like Mars or satellites like the moon,but i
10、t stayed on the earth.MoonMars2021/8/11 星期三23specialThis is how the earth began to show its special qualities.Many people think that this was important for the beginning of life.2021/8/11 星期三24Harmful gasesIt allowed the earth to dissolve harmful gases,which had become part of the earths atmosphere,
11、into the oceans and seas.2021/8/11 星期三25Possible lifeThat made it possible for life to begin to develop.2021/8/11 星期三26Paragraph 11)What is the main idea of Para.1?2)Why is water important on the earth?QuestionsIt talks about how water came into being on the earth and its importance to the developme
12、nt of life.Because water allowed the earth to dissolve harmful gases into the oceans and seas.2021/8/11 星期三27Small plants grow on the waterWhat scientists think is that the earth was different because of the arrival of small plants growing in the water on its surface.2021/8/11 星期三28OxygenNobody unde
13、rstood that these plants were the start of many changes.They multiplied and filled first oceans and seas with oxygen.2021/8/11 星期三29Shellfish and other fish appearThis encouraged the development of early shellfish and all sorts of fish.2021/8/11 星期三30Plants began to grow on dry landMany millions of
14、years later the first green plants began to appear on land.2021/8/11 星期三31Carbon dioxideScientists believe that taking carbon dioxide from the atmosphere and filling the air with oxygen helped life to develop.2021/8/11 星期三32Insects appearLater land animals appeared.Some were insects.2021/8/11 星期三33A
15、mphibians appearOthers,called amphibians,were able to live on land as well as in the sea.2021/8/11 星期三34Reptiles appearWhen the plants grew into forests,reptiles appeared for the first time.They produced young generally by laying eggs.2021/8/11 星期三35Dinosaurs appearLater,some huge animals,called din
16、osaurs,developed.They laid eggs too.They became the most important animals on the earth for millions of years.2021/8/11 星期三36Mammals appearBut when they disappeared,mammals became more important.They were the last group of animals2021/8/11 星期三37Produce youngand they were different because they produ
17、ced their young from within their bodies.2021/8/11 星期三381)Why is it wrong in films and stories to show dinosaurs and people together?Bacause dinosaurs died out long before human beings developed on the earth.Questions2021/8/11 星期三392)What is the main idea of Para.2-3?QuestionsIt tells us something a
18、bout the evolution（进化）（进化）process（过程）（过程）of plants and animals.2021/8/11 星期三40Fill in the blanks2345_6 _7891 small plants in small plants in _ and all and all sorts of fishsorts of fishgreen plants green plants on on _ insectsinsects_dinosaursdinosaurswater shellfishlandamphibiansforestsreptiles_mam
19、mals2021/8/11 星期三411 a cloud of dust The time line of the development of life on the earth2 a solid ball 3 presence of water 4 small plants grow on the water 5 shellfish and other fish appear 6 plants begin to grow on dry land 7 insects and amphibians appear 8 reptiles appear 9 dinosaurs appear 10 m
20、ammals(including humans)appear 2021/8/11 星期三42Animals with four legs and feetSmall clever animals,now with hands and feet,appeared and spread all over the earth.2021/8/11 星期三43Humans appear They developed new methods of growing food,hunting and moving around.As time went by they covered the earth an
21、d have become the most important animals on the planet.2021/8/11 星期三44Greenhouse effect But they are not taking care of the earth very well.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.2021/8/11 星期三45Too hotThe earth may bec
22、ome too hot for the lives on it.2021/8/11 星期三46futureWhether life will continue on the earth for million years to come will depend on whether this problem can be solved.2021/8/11 星期三47Discussion What will our future be if the earth may become too hot for lives on it?How to solve（解决）（解决）the problem o
23、f global warming?2021/8/11 星期三48Summary After the“Big Bang”,the earth was just a cloud of _ dust.It _ loudly with fire and rock,which were in time to produce the water _,carbon dioxide and other gases.Then small plants grew.They multiplied and _ the oceans and seas with oxygen.Many millions of years
24、 later the first green plants began to _ on land.When the plants grew into forests,_ appeared for the first time.They produced young generally by _ eggs.energiticexplodedvapourfilledlayingreptilesappear2021/8/11 星期三49Summary when dinosaurs disappeared,_ became more important.Now small clever animals
25、 with _ appeared and _ all over the world.As time went by they covered the earth and they are putting too much carbon dioxide into the _,which _ heat _ the earth into space.Whether life will continue on earth for millions of years to come will _ whether this problem can be solved.hands and feetdepen
26、d onfrompreventatmospherespreadmammals2021/8/11 星期三50Taking good care of the earth is taking good care of ourselves!2021/8/11 星期三51 Homework1.Continue the discussion“How to solve the problem of global warming.”with your classmates.2.Retell the passage using about 100 words.2021/8/11 星期三522021/8/11 星期三53