人教新课标必修3Unit4课件.ppt

1、Astronomy:the science of the starsWhat are the names of the eight planets that circle our sun?What is their order from the sun?地球地球 _木星木星 _火星火星 _水星水星 _海王星海王星 _土星土星 _天王星天王星 _金星金星 _EarthJupiterMarsMercuryNeptuneSaturnUranusVenusAstronomy is one of the oldest sciences.It is the scientific study of cele

2、stial objects(such as stars,planets,comets,star clusters and galaxies)and phenomena that originate outside the Earths atmosphere(such as the cosmic background radiation).It is concerned with the evolution,physics,chemistry,meteorology,and motion of celestial objects,as well as the formation and deve

3、lopment of the universe.Astronomy is a multidisciplinary subject and usesknowledge from both math and physics.Total lunar eclipse(月全食）月全食）Total solar eclipse(日全食日全食)Meteor rain（流星雨）（流星雨）Comet(彗星彗星)What interests you in astronomy?Do you know any questions that astronomers are interested in?How did li

4、fe begin on Earth?How did life begin on Earth?How was the universe formed?How was the universe formed?1.What interests you in astronomy?1.What interests you in astronomy?2.Do you know any questions that astronomers are 2.Do you know any questions that astronomers are interested in?interested in?3.Ho

5、w old is the universe?How old is the earth?3.How old is the universe?How old is the earth?4.How was the universe formed?4.How was the universe formed?5.How did life begin on Earth?5.How did life begin on Earth?6.Which were the first creature or plants on 6.Which were the first creature or plants on

6、earth?earth?7.Do you know what the order for the development 7.Do you know what the order for the development of plants and animals is?of plants and animals is?Free TalkBrainstormingBrainstormingDo you know each religion or culture has its own ideas about the origin of the universe or life?Chinese L

7、egends(传说传说)Pangu separates the sky from the earth.His whole body then turns into all kinds of things in the universe.Legend:The Goddess Nuwa mended the heaven and created human beings from the clay(粘土).According to Bible(圣经),God created the world and the first man,Adam(亚当)and the first woman,Eve(夏娃

8、).God created the world in seven days.Religious Beliefs Day 1:God spoke and separated light from darkness,creating Day and Night.Day 2:God spoke and separated the water creating sky and ocean.Day 3:God spoke and created dry land.Day 4:God spoke and created the sun,the moon and stars.Day 5:God spoke

9、and created living things in the air and sea.Day 6:God spoke and created the land animals and the first man.Day 7:God rested and called this day Holy.Scientific Theories Famous scientists such as Newton,Einstein and Stephen Hawking had their own theory about the origin of the universe.The universe b

10、egan from the Big Bang.Life first began in the sea on the earth.Life was brought to the earth by ET from outer space.Life came from a comet which hit the earth.Fast readingA brief introduction on how the universe developed and how life began on the earth.Careful readingPara 1:Para 2:Para 3:Para 4:Pa

11、ra 5:A widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plants and animals on the earth.The arrival of humans and their impact on the earth.Read the passage carefully and analyse its structure.earth,atmosphere a

12、nd waterlife developmenthuman beings1.What is the original earths atmosphere made up of?2.Why did scientists believe water is fundamental to the development of life?3.How did water come into being on the earth?4.Which kind of life-being first appeared on the earth,plants or animals?Why?5.Why were ma

13、mmals different from all life forms in the past?Carbon,nitrogen,water vapour,and other gases.2.Why did scientist believe water is fundamental to the development of life?Because water allowed the earth to dissolve harmful gases and acids into the oceans and seas to ensure a following chain reaction,w

14、hich made it possible for life to develop.1.What is the original earths atmosphere made up of?3.How did water come into being on the earth?The explosion of the earth produced water vapor,which turned into water when the earth cooled down.4.Which kind of life-being first appeared on the earth,plants

15、or animals?Why?At first,small plants began to appear on the surface of the water,they produce oxygen,which encouraged the later development of early shellfish and all sorts of fish.5.Why were mammals different from all life forms in the past?They were different because they produced their young from

16、 within their bodies and produce milk to feed them.（）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.（）6 Plants began to grow on dry land.（）7 The earth was a cloud of dust.（）8 Water appeared on the ea

17、rth.（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.5106）2948371 Put the order of development of life.12 11 Post readingDiscuss the following questions.1.Why was the earth different from the other pl

18、anets?3.Why is it wrong to show films with dinosaurs and people together?2.Why 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 provide oxygen for animals to breathe.4.There u

19、sed to be nine planets in the solar system.Recently scientists have decided 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

20、planet.Global warming.Lets review the evolution of life on the earth.After the“Big Bang”,the earth was full of water.Original cells appeared in the ocean.The cells in the water began to separate.Marine animals came into being.Some animals(amphibian&insects)came to land.Reptile appeared.dinosaurs mam

21、malsMan had evolved from apes.We are making the world better.We are making the world worse.Discussion solar energy plant trees recycle rubbish prevent desertificationsave water purify airWhat can we do take care of the earth?Whether life will continue on the earth depends on human beings.Only if we

22、care will we help;only if we help shall all be saved!Homework1.Collect more information about the development of life and make a poster with your group members.2.Read and retell the passage to learn the important and difficult language points.Work out the meaning of the new words and phrases through

23、 context.violentin time atmosphereunlikeharmfulexistprevent fromvery strong and suddennot latethe mass of air surrounding the Earth different fromable or likely to do harm to be present in a place or situation;to livestop from Make sentences with the new words and phrases.1.insects 2.plants3.reptiles(爬行类)4.shellfish(贝类)5.amphibians(两栖类)6.fish 7.mammals(哺乳类)Study of the groups of life(种类种类/物种物种)Look at the pictures and tell the groups.plantsreptiles(爬行类爬行类)shellfish(贝类贝类)fishinsectsmammalsamphibians(两栖类两栖类)