how-life-began-on-the-earth英语公开课

1、2021/3/131 Unit 4 Astronomy: the science of the stars 2021/3/132 We live on the same planet the earth 2021/3/133 1. Do you know the origin of life on earth? 2. Each religion or culture has its own ideas about how life began on earth. 2021/3/134 In Chinese culture _ separates(分分) the sky from the ear

2、th. Pangu 盘古盘古 sky earth 2021/3/135 _ made human beings.Nuwa (女娲女娲) 2021/3/136 In western countries: _ created the world and all living things. God (上帝上帝) 2021/3/137 Do you know what a scientific idea is? Background knowledge The Big Bang is the term used to describe a huge explosion that scientists

3、 believe happened about 15 billions years ago. Nobody knows what caused the Big Bang. But it was the event that created our universe. The Big Bang The universe began with a Big Bang. 2021/3/138 Read the passage on P25 quickly, and match the right main idea of each paragraph. How many parts can the t

4、ext be divided into? Step 1. Fast reading How life began on the earth 2021/3/139 Para.1 Para.2 Para.3 Para.4 Para.5 A theory about how the universe was formed The formation(形成）形成） of the earth The importance of water for life The development of plants and animals The arrival of humans and their effe

5、cts on the earth Part1: The development of the earth Part2:The development of life. 2021/3/1310 ( 2 ) Detailed Reading Part 1(13): The development of the earth 2021/3/1311 Part1 (para13) The development of the earth (1) After the Big Bang, what happened? (2) What happened to the solid globe next? (3

6、) What did the water vapour and gases were to make? (4) What appeared after the earth cooled down? (5) What did the water do? How did the earth come into being? 2021/3/1312 (1) After the Big Bang, what happened? a cloud of dust a violent solid ball Settled into 2021/3/1313 exploded with fire and roc

7、k produced water vapour and gases (2) What happened to the solid globe next? In time 2021/3/1314 (3) What did the water vapour and gases were to make? the earths atmosphere 2021/3/1315 Water appeared on its surface which is important for the beginning of life on the earth. (4) What appeared after th

8、e earth cooled down? 2021/3/1316 (5) What did the water do? It allowed the earth to dissolve harmful gases and acids into the oceans and seas. 2021/3/1317 a cloud of _ Big Bang a solid _slowly combine the earth _ down it exploded loudly with _ and _ water the earths _ dust ball/globe fire rock atmos

9、phere cooled How did the earth come into being(产产 生）生）? 2021/3/1318 According to the pictures, have a try to retell the development of life. 2021/3/1319 A cloud of energetic dust A solid ball Atmosphere A world full of water 4 1 3 2 Combine into Explode with fire and rock dissolve harmful gases Cool

10、 down 2021/3/1320 Part 2 (Part 2 (45) The development of life The development of life 2021/3/1321 Part2 (para45) The development of life Read para4 carefully and make a timeline of the development of life 2021/3/1322 water 1. 2. 10. 3. 4. insects (on land) 5. 6. 7._ 8. dinosaurs (on land) 9._ 11. sm

11、all _ in water _ and all sorts of fish green plants on land _(on land and in water) forests (on land) (on land) small clever animals with _ plant s shellfish amphibian s reptile s mammals hands and feet 1. a timeline of the development of life 2021/3/1323 2021/3/1324 2021/3/1325 the cleverest animal

12、s 2021/3/1326 The arrival of _ encouraged the _of early _. Many millions of years later _ began to appear _. Later _ appeared. Some were_. Others called _, were able to live on lands well as _. When the plants grew into forests, _appeared for the first time. After they disappeared, _became more impo

13、rtant. They were the last group of animals different from because they _milk from within their bodies. development shellfish and all sorts of fish on land land animals amphibians dinosaurs mammals produced small plants the first green plants insects in the sea 2021/3/1327 Read pare5 carefully .find

14、out the answer. 1. What problem is caused by human being? They caused global warming.They caused global warming. 2021/3/1328 2021/3/1329 The earth is getting warmer each year.what effects will this have? How to solve this problem? 2021/3/1330 Suggested Answers: The earth will be so hot that no life will exist（存在）（存在）on the earth any more. To solve this problem, people should protect the earth carefully. They must stop putting too much carbon dioxide into the air , reduce pollution, co