探究式教学【教学课件】Unit 4 人教版）

1、畅言教育人民教育出版社 必修三 Unit 4 Astronomy: the science of the stars本课时编写：蚌埠二中 马爱军 老师畅言教育人民教育出版社 必修三 starssuper moonthe big bang the black holeWarming up畅言教育人民教育出版社 必修三 Astronomy is a science that studies celestial objects such as planets, moons, stars, comets, nebulae (星云星云) & galaxies.畅言教育人民教育出版社 必修三 Solar

2、SystemWhats this?Do you know anything about the solar system?star 恒星恒星planet 行星行星Which is a star? Which is a planet?畅言教育人民教育出版社 必修三 What are the names of the eight planets that circle the sun?畅言教育人民教育出版社 必修三 海王星海王星 Neptune水星水星Mercury 金星金星Venus 地球地球Earth 火星火星Mars 木星木星Jupiter 土星土星Saturn天王星天王星Uranus 畅言

3、教育人民教育出版社 必修三 solar systemScientists now think Pluto is too small to be called a planet.Q:Do you know why Pluto is no longer considered a planet?Q:So far, life hasnt been discovered on other planets. Why is the earth different from them?畅言教育人民教育出版社 必修三 How does the Sun produce energy?Is there intell

4、igent life in the Universe?What do we know about planets around other stars?What is the eventual fate of the Sun?Where might we find life in the Solar System?What determines the surface temperature of a planet?Possible answers:What interests you in astronomy? Do you know any questions that astronome

5、rs are interested in?畅言教育人民教育出版社 必修三 We can only detect about 5% of the matter in the universe. The Suns core releases the equivalent of 100 billion nuclear bombs every second.Light from distant stars and galaxies takes so long to reach us that we are actually seeing these objects as they appeared i

6、n the past.畅言教育人民教育出版社 必修三 Shooting stars (流星流星) really arent stars. They are usually just tiny dust particles falling through our atmosphere. Even though Mercury is the closest planet to the Sun, temperatures there can reach-280 degrees F on its surface.Earth is the only planet not named after a go

7、d. 畅言教育人民教育出版社 必修三 A Quiz Game 1. How old is the earth? A. About 3.5 billion years B. About 4.5 billion years C. About 5.5 billion years D. About 6.5 billion years 2. _ of the earth surface is covered by water. A. 20% B. 30% C. 50% D. 70%Lets turn to the Earth the planet we should know well. Now do

8、a quiz to see how much you know about our planet the Earth.畅言教育人民教育出版社 必修三 3. How many planets are there in the Solar System? A. 6 B. 7 C. 8 D. 9 4. What is the total population of humans on the earth? A. About 3.5 billion B. About 4.5 billion C. About 5.5 billion D. About 6.5 billion畅言教育人民教育出版社 必修三

9、 5. How long does the rotation (自转自转) of the earth take? A. 12 hours B. 24 hours C. a month D. 365 days6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebrated? A. April 22 B. May 4 C. August 21 D. November 11畅言教育人民教育出版社 必修

10、三 8. Which ocean is the largest? A. The Pacific Ocean B. The Arctic Ocean C. The Indian Ocean D. The Atlantic Ocean9. Which country has the largest area? A. Canada B. China 畅言教育人民教育出版社 必修三 Brainstorm头脑风暴启发思考畅言教育人民教育出版社 必修三 The origin of life on earth is a question that interests astronomers. What do

11、 you know about it?Each religion and culture has its own ideas about how life began on earth. What do you know?畅言教育人民教育出版社 必修三 Pangu separates the sky from the earth.畅言教育人民教育出版社 必修三 Nvwa made humans.畅言教育人民教育出版社 必修三 The Biblical AccountDay 1: God spoke and separated light from darkness creating Day a

12、nd 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, moon and stars. Day 5: God spoke and created living creatures in the air and sea. Day 6: God spoke and created the land animals and man. Day 7: God

13、rested and blessed this day calling it Holy. 畅言教育人民教育出版社 必修三 Brahma the Hindu god of creationHe is the creator of the universe and all living beings are said to have evolved from him.畅言教育人民教育出版社 必修三 Prediction Look at the pictures. Do you know the topic of this unit?畅言教育人民教育出版社 必修三 海洋里的细胞开始分裂 登陆爬行动物

14、恐龙畅言教育人民教育出版社 必修三 Mammals畅言教育人民教育出版社 必修三 The development of human beingsThey developed new methods of growing food, hunting and moving around. As time went by they covered the earth and have become the most important animals on the planet.畅言教育人民教育出版社 必修三 Read the text quickly and fill in the blanks.

15、 The text mainly tells us the formation of the _ and the development of _ on it.earth life 1自主或小组探究畅言教育人民教育出版社 必修三 1. What is the main idea of the text?2. Which paragraph are the questions mentioned in?1) How old is the earth?2) How does the universe begin?3) Is there any water in the Mars?4) When d

16、id dinosaurs disappear?5) Which animal is the most important one on the earth?How life began on the earthAnswer the questions according to the text.畅言教育人民教育出版社 必修三 Before life appearedPara.3: the importance of water for lifePara.1: a widely accepted theory about the formation of the universePara.2:

17、the formation of the earth畅言教育人民教育出版社 必修三 The development of lifePara.4: the development of plants and animals on the earthPara.5: the arrival of humans and their impact on the earth畅言教育人民教育出版社 必修三 Shellfish & fishPlants on landamphibiansForestsReptiles Dinosaurs Mammals Land animalsSmall Plants in

18、the waterInsectsPara.4: the development of plants and animals on the earth畅言教育人民教育出版社 必修三 1. When did the “Big Bang” happen? It happened several billion years ago.2. What form was the earth after the “Big Bang”? The earth was still just a cloud of dust.Read the passage quickly and answer the questio

19、ns.2畅言教育人民教育出版社 必修三 3. What made up the earths atmosphere after the earth exploded? Carbon dioxide, nitrogen, water vapour and other gases. 4. How did water come into being on the earth? As the earth cooled down after it exploded, water came into being.畅言教育人民教育出版社 必修三 5. Whats the significance of th

20、e presence of water on the earth? It allowed the earth to dissolve harmful gases and acids into the oceans and seas.6. What was important to the development of fish? oxygen. 畅言教育人民教育出版社 必修三 7. What made possible the rise of mammals on the earth? The disappearance of dinosaurs made possible the rise

21、of mammals on the earth.8. Why are mammals different from all life forms in the past? They gave birth to young baby animals and produced milk to feed them.畅言教育人民教育出版社 必修三 3Read the passage carefully and fill in the blanks. TimeWhat happenedBig Bang_ began to form and combine to create stars and othe

22、r bodies.Atoms畅言教育人民教育出版社 必修三 Between 4.5 and 3.8 billion years ago Dust settled into a solid and _ globe. The earth exploded to produce its _. The continued _ of water allowed the earth to dissolve harmful gases and _ into the oceans and seas.violentatmospherepresenceacids畅言教育人民教育出版社 必修三 Many milli

23、ons of years later The first small plants on the surface of the water produced _. Early _ and all sorts of fish appeared. Green plants began to grow on land. Insects and _ appeared.oxygenshellfishamphibians畅言教育人民教育出版社 必修三 About 2.6 million years agoSome small _ animals with hands and feet appeared a

24、nd spread all over the earth.NowHumans produce too much carbon _, making the earth too hot.cleverdioxide畅言教育人民教育出版社 必修三 How life began on the earth.“Big Bang”other bodies_ starsEarth: a cloud of _atomsdust4畅言教育人民教育出版社 必修三 a solid _the earths _other _Water: _ to the development of lifewater vapour ni

25、trogen carbonextremely small _ on the surface of the waterglobegasesatmospherefundamentalplants畅言教育人民教育出版社 必修三 early _ and all sorts of fishgreen plants on landland animalsinsectsamphibians_huge animals (dinosaurs)the rise of _human beingsshellfishreptilesmammals畅言教育人民教育出版社 必修三 Think about what you

26、have read and discuss these questions in pairs.1. Why was the earth different from other planets? Because the water remained on the earth.2. Why did the plants grow before the animals came? Because plants provide oxygen for animals to breathe. 5畅言教育人民教育出版社 必修三 3. Why is it wrong to show films with d

27、inosaurs and people together? Because dinosaurs died out long before human beings developed on the earth.畅言教育人民教育出版社 必修三 4. There used 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 that planet?

28、Do you know why they removed it? The name is Pluto. Scientists now think it is too small to be called a planet. 5. What problem is caused by human beings? Human beings caused global warming.畅言教育人民教育出版社 必修三 畅言教育人民教育出版社 必修三 We are making the world better.We are making the world worse.ABDiscussion 1 协作

29、交流畅言教育人民教育出版社 必修三 developed new methods of growing food(1) What humans developed?developed new methods of hunting developed new methods of moving around畅言教育人民教育出版社 必修三 (2) But they are not taking care of the earth very well. What problem are humans causing ?putting carbon dioxide into the atmosphere

30、the earth may become too hot畅言教育人民教育出版社 必修三 As a student, what little things can we do for the earth?Group WorkDiscussion 2 畅言教育人民教育出版社 必修三 Design an activity on Earth Dayl What the activity is about l Why the activity is designedl When and where to do the activity l Who takes part in the activityl

31、What to be done in the activityl 畅言教育人民教育出版社 必修三 Lets take part in the activities to save the earth! Use the following words or phrases to help you:prevent from harmful global warmingcarbon dioxide in turn depend on as a result atmosphere畅言教育人民教育出版社 必修三 solar energy plant trees recycle rubbish preve

32、nt desertificationsave water purify air畅言教育人民教育出版社 必修三 After the “big bang”, the earth was still just a cloud of _, it _loudly with fire and rock, which were _ to produce the_, water vapour and other gases. Then _ began to appeared on the earth. _ in water are considered to be the earliest lives on the ea