必修3第四单元课件.ppt

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1、,Astronomy:the science of the stars,Unit 4,Warming up Do you know how many planets circle around the sun in our solar system?,In our solar system eight planetscircle around the sun.,1111,地球 _木星 _火星 _水星 _海王星 _,F.冥王星 _G.土星 _H.天王星 Uranus_I.金星 Venus_,Earth,Jupiter,Mars,Mercury,Neptune,Pluto(x),Saturn,My

2、 Very Excellent Mother Just Sent Us Nine Pizzas,How to remember the order of the eight planets around the sun?,Earth,Jupiter,Mars,Mercury,Neptune,Saturn,Uranus,Venus,Each religion and culture has its own ideas about how life began on the earth.,中国神话传说中有盘古开天地的说法。巨人盘古用一把利斧劈开混沌,将天地分开。死后,他的气息化成风和云,声音变成轰

3、轰的雷声,左眼化为太阳,右眼化为月亮,手足与四肢变成大地的四极与五方的名山,血液化成江河,筋脉铺成道路,肌肉形成田地,须发成为星星,牙齿和骨骼化为金属、珍珠、玉石,汗水成为滋润万物生长的甘霖和雨露。,Chinese Legends,Pangu separates the sky from the earth.,女娲补天,Legend:The Goddess Nuwa mended the heaven and created human beings from the clay(粘土).,Religious BeliefAccording to Bible,God created the wo

4、rld in 7 days.,Day 1:God created Day and Night.,Day 2:God created sky.,Day 3:God created dry landthe earth,and seas.,Day 4:God created two great lights(the sun,the moon)and stars.,Day 5:God created living things in the air and sea.,Day 6:God created the land animals and the first man.,Day 7:God rest

5、ed and called this day Holy.,How Life Began on the Earth,Listen and match,1.Listen to the passage and match each paragraph with its main idea.2.Tell the main idea of the text in one sentence.,Paragraph 1Paragraph 2Paragraph 3Paragraph 4Paragraph 5,A.How humans appeared and what effects they have cau

6、sed to the earth.B.Water is very important for life on the earth.C.How the earth formed.D.How the plants and animals on the earth developed.E.It is widely accepted that the universe began with a“Big Bang”.,Paragraph 1Paragraph 2Paragraph 3Paragraph 4Paragraph 5,How humans appeared and what effects t

7、hey have caused to the earth.B.Water is very important for life on the earth.C.How the earth formed.D.How the plants and animals on the earth developed.E.It is widely accepted that the universe began with a“Big Bang”.,The text mainly tells us the formation of the earth and the development of life on

8、 it.,Careful reading,Read the passage carefully and answer the following questions1.What was there on the earth before life could begin?Water vapour,carbon dioxide,oxygen,nitrogen and other gases.,2.Why do scientists think there has never been life on the moon?Because there is no water on the moon.3

9、.Why did animals first appear in the seas?Because water allowed the earth to dissolve harmful gases into the oceans and seas.,4.Why did green plants help life to develop?Because green plants can take carbon dioxide from the atmosphere and fill the air with oxygen.,5.Why were mammals different from o

10、ther animals?They were different because they produced their young from within their bodies.,Detailed Reading,The development of the earth,Stage 1:The development of the earth,1)After the Big Bang,what happened?,a cloud of dust,a violent solid globe,exploded with fire and rock,produced carbon,nitrog

11、en,water vapour&gases,(2)What happened next?,(3)What did the water vapour and gases form?,the earths atmosphere,Water appeared,)4)What appeared on the earth then?,(5)What did the water form?,oceans and seas,The development of life,extremely small plants,First,early shellfish,Stage 1:The development

12、of life in water,all sorts of fish,green plants on land,insects on land,Stage 2:The development of life on land Next,amphibians on land and in the water,Green plants grew into forests Later,reptiles on land,dinosaurs on land,(1)What life developed after forests appeared?,After that,mammals on land,2

13、)What life developed after dinosaurs?,small clever animals,(3)What life developed after mammals?Finally,1.Big Bang,How did the earth come into being?,（）1 Insects and amphibians appeared.（）2 Dinosaurs appeared.（）3 The earth became a solid ball.（）4 Small plants grew on the water.（）5 Reptiles appeared.

14、（）6 Plants began to grow on dry land.（）7 The earth was a cloud of dust.（）8 Water appeared on the earth.（)9 Shellfish and other fish appeared.（）10 The universe began with a“Big Bang”.（）11 Clever animals with hands and feet appeared.（）12 Mammals appeared.,8,7,5）,6,4,1,10,3,9,2,Put the order of develop

15、ment of life.,12,11,Summary,The universe began with a“B_”.The earth was a cloud of dust.The earth became a solid ball then it e_ with fire and rock.They produced carbon and other gases,which made the earths a_.When it cooled down,water appeared on the s_.Then small green p_grew on the water,and late

16、r shellfish and other fish appeared.,ig Bang,xploded,tmosphere,urface,lants,Summary,When plants began to grow on dry land,insects and a_appeared.Forests appeared before r_appeared.They produced young by l_eggs.Then d_ appeared in forests.The disappearance of dinosaurs made the rise of the animals ca

17、lled“m_”.At last small clever animals appeared,and later they grew into h_beings.,inosaurs,aying,mphibians,eptiles,ammals,uman,Post reading,Discuss the following questions.,1.Why was the earth different from the other planets?,3.Why is it wrong to show films with dinosaurs and people together?,2.Why

18、 did the plants grow before the animals came?,Because the water remained on the earth.,Because dinosaurs died out long before human beings developed on the earth.,Because plants provided oxygen for animals to breathe.,4.There used to be nine planets in the solar system.Recently scientists have decid

19、ed that one of them can no longer be considered a planet.Do you know the name of it?Do you know why they removed it?,5.What problem is caused by human beings?,Its name is Pluto.Scientists now think it is too small to be called a planet.,Global warming.,Homework,1.Find out language points and noun cl

20、auses in the reading passage.2.Discuss and analyse them.,.,We have only one earth!,solar energy,plant trees,recycle rubbish,prevent desertification,save water,purify air,Discuss:What can we do to take care of the earth?,Lets take part in the activities to save the earth!,Whether life will continue on the earth depends on human beings.,Only if we care will we help;only if we help shall all be saved!,Thank you!,