Unit-4-Astronomy-the-science-of-the-stars-Reading.ppt

1、Unit 4,Unit 4 Astronomy: the science of the stars,Reading,HOW LIFE BEGAN ON THE EARTH,Warming up,What are the names of the eight planets that circle the sun?,海王星 Neptune,水星 Mercury,金星 Venus,地球 Earth,火星 Mars,木星 Jupiter,土星 Saturn,天王星 Uranus,A Quiz Game,1. How old is the earth? A. About 3.5 billion yea

2、rs 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%,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 b

3、illion B. About 4.5 billion C. About 5.5 billion D. About 6.5 billion,5. How long does the rotation (自转) of the earth take? A. 12 hours B. 24 hours C. a month D. 365 days 6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebr

4、ated? A. April 22 B. May 4 C. August 21 D. November 11,8. Which ocean is the largest? A. The Pacific Ocean B. The Arctic Ocean C. The Indian Ocean D. The Atlantic Ocean 9. Which country has the largest area? A. Canada B. China C. Russia D. U.S.A,Prediction,Look at the pictures. Do you know the topic

5、 of this unit?,海洋里的细胞开始分裂,登陆,爬行动物,恐龙,Mammals,人类的兴起,Do you know what it was like before life appeared on earth?,1. What do we mean when we say we are studying a subject scientifically? Or whats the correct attitude towards science? We should be objective, not superstitious.,Answer these questions.,2.

6、 Whats the correct way to prove a scientific idea? We should design experiments to test it for several times. Then we can analyze the results and draw a conclusion at last.,3. What are the most important skills we need to be real scientists? Careful, objective and logical, draw conclusions from the

7、experiments and not impose conclusions on the data. (impose on 把强加于),1. The origin of life on earth is a question that interests astronomers. What do you know about it?,2. Each religion and culture has its own ideas about how life began on earth. What do you know? In China, we all know that Pangu se

8、parates the sky from the earth and Nvwa made humans.,Pangu separates the sky from the earth.,Nvwa made humans.,Other legends about the beginning of universe.,The Biblical Account,Day 1: God spoke and separated light from darkness creating Day and Night. Day 2: God spoke and separated the water creat

9、ing 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 rested and blessed this day calling it Holy.,India Brahm

10、a is the god first represented in the Hindu Triad. He is the creator of the universe and all living beings are said to have evolved from him., Big Bang,Gas,New stars,Dying stars,Remnants残余物,平面图,太阳系,地球大气,Read the text quickly and fill in the blanks. The text mainly tells us the formation of the _ and

11、 the development of _ on it.,earth,life,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 questions.,3. What made up the earths atmosphere after

12、the earth exploded? Carbon, 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.,5. Whats the significance of the presence of water on the earth? It allowed the earth to dissolve harmful gases and ac

13、ids into the oceans and seas. 6. What was important to the development of fish? oxygen.,7. What made possible the rise of mammals on the earth? The disappearance of dinosaurs made possible the rise of mammals on the earth. 8. Why are mammals different from all life forms in the past? They gave birth

14、 to young baby animals and produced milk to feed them.,Read the passage carefully and analyse its structure. Write down the main idea for each paragraph.,A widely accepted theory about the formation of the universe,The formation of the earth.,The importance of water for life,The development of plant

15、s and animals on the earth,The arrival of humans and their impact on the earth,Fill in the blanks in the following form.,Atoms,violent,atmosphere,presence,acids,oxygen,shellfish,amphibians,Reptiles,existed,gave birth to,clever,dioxide,True (T) or False (F). 1. The earth appeared before the Big Bang

16、happened. 2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on land.,F,F,T,T,5. Mammals appeared before the development of dinosaurs. 6. Dinosaurs could give bir

17、th to young baby animals and produced milk to feed them. 7. Human beings produce too much carbon dioxide which causes the global warming on the earth. 8. According to the text, human beings would disappear in the end.,F,F,T,F,How life began on the earth.,“Big Bang”,other bodies,_,stars,Earth: a clou

18、d of _,atoms,dust,a solid _,the earths _,other _,Water: _ to the development of life,water vapour,nitrogen,carbon,extremely small _ on the surface of the water,globe,gases,atmosphere,fundamental,plants,early _ and all sorts of fish,green plants on land,land animals,insects,amphibians,_,huge animals

19、(dinosaurs),the rise of _,human beings,shellfish,reptiles,mammals,Think about what you 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.,3. Why is it wrong to show films with dinosaurs and people together? Because dinosaurs died out long before human beings developed on the earth.,4. There used to be nine planets in the solar system. Recently scientists have decided that one of them can