Unit3 Lesson 1 The Sixth Extinction课件 2021-2022学年北师大版高中英语选择性必修第一册

Unit 3 Conservation Lesson 1 Period 1 Activate and share 1 What can you see from this picture? 2 What caused those animals and plants to be extinct? Activate and share 3 What does the word “extinction” mean? “Extinction” means a situation in which something no longer exists. It may talk about why “The Sixth Extinction” is going to happen and how we can handle the situation. 4 Can you predict what the text is about according to the title “The Sixth Extinction”? Read and explore Read the text and answer the questions. 1 How many times up to today has life on Earth almost died out? 2 About what percent of all species on Earth became extinct during the mass extinction known as the “Great Dying”? 3 What do scientists think will cause the next mass extinction? Five times. More than 90%. Human activity. Read and explore Read the text and complete the notes. Read and explore entire species are wiped out over 90% of all species that ever lived the third mass extinction, killed 90% to 96% of all species; the fifth event, which occurred 66 million years ago, caused the death of the dinosaurs Volcano eruptions, asteroids hitting the Earth from space, changes in sea levels, the decrease of oxygen content of the sea, global warming Change the way we live, including setting up special areas where plants and animals can be protected … 6 entire species are wiped out over 90% of all species that ever lived the third mass extinction, killed 90% to 96% of all species; the fifth event, caused the death of the dinosaurs Volcano eruptions, asteroids, sea levels, oxygen, global warming Change the way we live; change how we work and travel; improve our faming methods Based on the diagram, talk about the different aspects of extinctions. Read and explore 7 Read and explore 1 What did scientists find out in 2015? 2 Why does the writer think the sixth mass extinction will come? 3 Why does the writer believe we’ll probably die out if 75% of the Earth’s species die out? Read again and answer th