必修三Unit4-Astronomy-全单元[1]1PPT优秀课件

1、12Unit 4 Astronomy: the science of the starsa. Enable Ss to talk about the science of the stars.Teaching goals 教学目标教学目标 b. Understand the text and answer the following questions: Teaching important points教学重点教学重点 Teaching difficult points教学难点教学难点 d. Discussion.What will our future be if the earth ma

2、y become too hot for the lives on it?What was there on the earth before life could begin?Talk about the beginning of life on the earth. Teaching methods教学方法教学方法a. Skimming and scanning.b. Asking-and-answering activity to check the Ss understanding of the text.c. Individual, pair or group work to fin

3、ish each task.345The Solar SystemThe Solar System1111Unit 4Unit 4 Astronomy: Astronomy: the science of the starsthe science of the stars eight planets many comets(彗星彗星) other objects 7NeptuneMercury Venus Earth Mars Jupiter SaturnUranus What are the names of the eight planets that circle our sun?水星水

4、星金星金星地球地球火星火星木星木星土星土星天王星天王星海王星海王星89 Du Minjunxi comes from the planet of Kmt184.05. its said that its climate and environment are similar to the earths. But do it really exist? Maybe not because only on earth there is life.10How Life Began on the EarthPeriod 111 Each religion and culture has its own

5、 ideas about how life began on earth. What do you know? In China, we all know that Pangu separates the sky from the earth and Nvwa made humans. In western culture, God created the world in seven days. 12 14 Fill in the blanks to learn about how life began. understand the meaning of each paragraph.15

6、Para.1 Para.2Para.3The _ of the earthThe importance of _ for lifeThe_ of plants and animalsThe arrival of _ and their effects on the earththeoryformation water developmenthumansBefore life appeared.Different lives developed.Para.4Para.5How life began on the earthA _ about how the universe was formed

7、1617Read Part1 (para13) Before life appeared How did the earths atmosphere form? Why was the earth different from the other planets? What a role the water played in the development of life?181. How did the earths atmosphere form? The earth was so violent. It exploded loudly with fire and rock to pro

8、duce carbon, nitrogen, water vapor and other gases, which were to make the atmosphere.2. Why was the earth different from the other planets? Because the water on other planets had disappeared later.193. What a role the water played in the development of life? The presence of water allowed the earth

9、to dissolve harmful gases and acids into the oceans and seas. This produce a chain reaction which made it possible for life to develop20water 1 small plants in water2 shellfish and all sorts of fishgreen plantson land3 insects (on land)4 amphibians (on land and in water)forests5 reptiles (on land)6

10、dinosaurs (on land)7 mammals (on land) small clever animals with hands and feet8 humanRead Part2 (para45)212223Big BangA cloud of dust Atmosphere The earthA solid ballwater24waterPlants in the waterShellfish and fishPlants on land25Insects and amphibiansReptiles Dinosaurs Mammals 26 humans came into

11、 being and spread all over the world.272829Look! There is someone cutting a tree down 30What should we do for our earth? You can use the following words or phrases water source, make full use of , drinking water , stop.electricity important, turn off. forests cut down, recycle .31 Save water. Water

12、is the source of life. No water, no life. Save electricity. It is important. We cant imagine what Save forests. They are useful .Please stop cutting them down and use recycled paper instead. Make our world aOnly if we care will we help!Only if we help shall all be saved!So its very important for us

13、to do so. Not only should we protect drinking water and stop polluting it, but also make full use of it.the life will be like without it. Everyone should do his best to save electricity. Dont forget to turn off lights or other electric machines when we finish working.green one to live in.3233Lets ta

14、ke part in the activities to save the earth!3435 About how to protect the earth write a short passage use the sentences you just now prepared.363738Read Part1 (para13) Before life appeared According to a widely accepted theory, how did the stars form? How did the earths atmosphere form? Why was the

15、earth different from the other planets? What a role the water played in the development of life?391. According to a widely accepted theory, how did the stars form?2. How did the earths atmosphere form? The universe began with a “Big Bang” that threw matter in all directions, then atoms began to form and combine to create stars. The earth was so violent. It exploded loudly with fire and rock to produce carbon, nitrogen, water vapor and other gases, which were to make the atmosphere.403. Why was the earth different from the other planets?4. What a role the water played in the development o