How-life-began-on-the-earth(1).ppt

1、Unit 4,Astronomy: the science of the stars,Unit 4 How life began on the earth,The Big Bang,Group work: describe the pictures,How Life Began on the Earth？,Each religion and culture has its own ideas about how life began,In Chinese legend, it says _ created the world. He separates the sky from the ear

2、th,Pangu（盘古）,_ made human beings.,Nuwa (女娲),the God,In Bible, the world and the whole universe was created by _, who created the first man and the first woman.,Words 1. Read the words 2. Guess words according to the meaning.,1._: not like, different from 2._:causing or likely to cause harm 3._:a kin

3、d of very important gas, without it we cant live 4._:therefore, as a result 5._:increase in number or amount.,unlike,harmful,oxygen,thus,multiply,读单词后，根据提示说出正确的单词。,Fast reading,According to the time, put the things into the right order.,big bang,earth,air/ atmosphere,water,life,1,2,3,4,5,快速阅读课文后，根据时

4、间顺序，排列下列事件,big bang,earth,air/ atmosphere,water,life,Part one (1-3) The formation of the earth, air and water,Part two (4,5) The development of the life on the earth,将文章分为两部分。,Skim the passage and match the main idea with each paragraph.,Para. 1 The formation(形成) of the earth. Para. 2 The importance

5、 of water for life. Para. 3 A widely accepted theory about the formation of the universe.,Careful reading,Paragraph 1-3,Careful reading,Paragraph 1-3,Before the big bang, atoms had formed stars and other bodies. Our earth came into being between 4.5 and 3.8 billion years ago. The continued presence

6、of water allowed the earth to dissolve harmful gases and acid into the air.,F,F,T,after,water,Para. 4 The arrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth.,Careful reading,Paragraph 4,5,Read part2 (paragraph 4 and 5), and finish the chart:,s

7、hellfish,insects,dinosaurs,mammals,Listen to the tape again 2. Discussion : In the last paragraph, what problem is caused by human beings? How to protect the earth and make it a better place to live on?,Read again,according to begin with in time what is more important is that 5. it was/is obvious th

8、at 6. be fundamental to 7. allow sb to do,8. fill with 9. all sorts of 10. as well as,11. for the first time 12. give birth to 13. be different form 14. in ones turn 15. look after 16. prevent from 17. as a result 18. depend on,1. It was not immediately obvious that water was to be fundamental to th

9、e development of life.,水对于生命的发展会起关键作用，,这一点当时并 不明显。,2. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.,很多科学家相信，游泳地球上长期有水存在，使得地球得以吧有害气体和酸性物质溶解在海洋里。,很显然，他并不知道事实。 很多人相信 地区起源于宇宙大爆炸。,It was obvious that he

10、 didnt know the fact.,What many people believe that the earth began with a “ Big Bang”.,Discussion : In the last paragraph, what problem is caused by human beings? How to protect the earth and make it a better place to live on?,talk freely,我们应当停止排放过多的二氧化碳。 因为二氧化碳会使得地球上的热不能排放到大气中。 2. 不要忘记保护水资源。 水对生命的发展起着关键作用，这一点现在已经很明显了。,绿,是 双手轻轻托起的一株嫩芽,厚,厚,重,重,Planting more trees,绿,是 孩子脸上无暇的笑容,绿,是我们生生不息的绿色家园,希,希,望,望,传,传,承,承,Lets take part in the activities to save the earth! Dont let our tear