人教版必修3：Unit+4+Astronomy_+the+science+of+the+stars+warming+up+and+reading（共33张PPT）2

1、Unit 4 Astronomy: The science of the stars Warming up,Pre-reading,Reading,Whats the meaning of the word “Astronomy”?,I. Warming up,the science of stars; the scientific study of stars and planets.,2. What words will you think of when we talk about this topic?,star, planet, the sun / moon / earth, sol

2、ar system,恒星 行星 太阳 月球 地球 太阳系,3. How many planets are in the solar system?,8,4. Do you know the correct order of their distance to the sun?,nearest to the sun?,farthest to the sun?,5. The names of eight planets.(remember them),Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune,1) 水星 2) 金星 3) 地球 4

3、) 火星 5) 木星 6) 土星 7) 天王星 8) 海王星,Mercury,Venus,Earth,Mars,Jupiter,Uranus,Saturn,Neptune,6. Put them in correct order on P25.,Do you know their origin?,II. Pre-reading,Have you ever asked your mother, “Mom, where do I come from”?,2. The origin of life on earth is a question that interests astronomers.

4、What do you know about it?,3. Each religious and culture has its own ideas about how life began on earth. What do you know?,III. Fast-reading,1. In this unit, well learn something more scientific. 2. Whats the title of the text?,3. From the title, we can predict that the text may tell us the origin

5、of life on the earth.,How life began on the earth,4. Match the main idea for each paragraph.,Para.1 Para2. Para3. Para4. para5,The importance of water for life.,A theory about how the universe was formed.,The formation of the earth,The arrival of humans and their effects on the earth.,The decelopmen

6、t of plants and animals.,Detailed reading This text can mainly divided into two stages,Stage 1 : The development of the earth Stage 2 : The development of life,(para 13),(para 45),Stage 1: The development of the earth,(1) After the Big Bang, what was the earth like?,a cloud of dust,a solid globe,exp

7、loded with fire and rock,produced water vapour and gases,(2) What happened next?,(3) What did the water vapour and gases form?,the earths atmosphere,Water appeared,(4) What appeared as the earth cooled down?,water is important for the beginning of life on the earth.,Why is water so important for the

8、 beginning of life? Because water allowed the earth to dissolve harmful gases into oceans and seas.,？,Stage2 The development of life,small plants appears in water,1.What life developed after water appeared?,Shellfish and all sorts of fish,2.What life developed in water next?,green plants began to gr

9、ow on land,insects appeared,3.What about the life on land?,amphibians on land and in the water,forests,4. What life developed next on land?,reptiles appeared,dinosaur developed,5.What life developed after forests appeared?,mammals on land,6.What life developed after dinosaurs?,small clever animals,7

10、. What life developed after mammals?,1.Who are the small clever animals with hands and feet? 2. Are they taking care of the earth well? Why?,?,Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.,The earth may become too h

11、ot to live on .,Can you fill in the blanks?,2,3,4 5,6,7 8 9 10,1 small plants in water,shellfish and all sorts of fish,insects,reptiles,amphibians,mammals,dinosaurs,humans,plants,animals,Green plants on land,forests,1. Insects and amphibians appeared. 3. The earth became a solid ball. 5. Reptiles ap

12、peared. 7. The earth was a cloud of dust 9. Shellfish and other fish appeared. 11. Clever animals with hands and feet appeared,2. Dinosaurs appeared. 4.Small plants grew on the water. 6. Plants began to grow on dry land. 8. Water appeared on the earth 10. The universe began with a “Big Band”. 12. Ma

13、mmals appeared.,8,3,10,9,11,5,1,7,4,12,6,2,Can you put the order of development of life into a time line?,Ex.2 on P27,How life began on earth is one of the biggest puzzles that scientists found hard to solve. What other puzzles are hidden in the passage?,Discussion,Ex.5 on P27,How does the universe(

14、earth) form? Why did the earth cool down? Why did water disappear on other planet? How did the dinosaur disappear ?,summary,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

15、on the earth.,dust,exploded,in time,carbon,water,_ in water are considered to be the earliest lives on the earth. The O2they supplied encouraged the lives of_. Slowly green plants grew on land, which were followed by _like insects & _. When the plants grew into_, _ appeared. Then _ developed but disappeared later, which made the rise of a totally different animal,_, possible, and finally _ spread all over the world.,shell-,-fish and fish,amphibi