北师大版（2019）选择性必修 第一册Unit 3 Conservation Lesson 1 The Sixth Extinction课件(共16张PPT)

(共16张PPT)
Unit 3 Conservation
Lesson 1 The Sixth Extinction
北师大版（2019） 选择性必修一
重点词块
1．at the rate of… ________________
2．be based on… ________________
3．lay eggs ________________
4．be at risk ________________
5．wipe out ________________
6．die out ________________
7．up to… ________________
8．in short ________________
9．according to ________________
10．take steps ________________
11．be to blame ________________
以……的速度/比例　
基于……　
产卵/下蛋　
处境危险；受到威胁　
彻底毁灭　
消失；绝迹；灭绝
高达……　
简而言之　
根据；按照　
采取措施　
把……归咎于　
1. How many times up to today has life on Earth almost died out
a. Once. b. Five times. c. More than 10 times.
Activity 1
How much do you know about extinction Choose the option based on your knowledge.
2. About what percent of all species on Earth became extinct during the mass extinction known as the “Great Dying”
a. Less than 10%. b. Nearly 50%. c. More than 90%.
3. What do scientists think will cause the next mass extinction
a. Human activity. b. Natural causes. c. Unknown reasons.
a
4. Which mass extinction was the worst one in history and got the nickname of the “Great Dying”
a. The third time. b. The fourth time. c. The fifth time.
5. Which mass extinction are we entering now
a. The second. b. The sixth. c. The twelth.
Watch a video clip to check the answer.
3. What do scientists think will cause the next mass extinction
a. Human activity. b. Natural causes. c. Unknown reasons.
1. How many times up to today has life on Earth almost died out
a. Once. b. Five times. c. More than 10 times.
Activity 1
How much do you know about extinction Choose the option based on your knowledge.
2. About what percent of all species on Earth became extinct during the mass extinction known as the “Great Dying”
a. Less than 10%. b. Nearly 50%. c. More than 90%.
a
4. Which mass extinction was the worst one in history and got the nickname of the “Great Dying”
a. The third time. b. The fourth time. c. The fifth time.
5. Which mass extinction are we entering now
a. The second. b. The sixth. c. The twelth.
The sixth extinction
para 1
para2
para 3
consequences
solutions
Background information
Background information
solutions
consequences
para 4
causes
causes
Read the text The Sixth Extinction quickly. Think about the different aspects of it and make a match.
Fast reading
Activity 2
background information
Main reasons that cause extinctions
Read Para.1 carefully. Summarize what detailed information is involved and find evidence to support your ideas based on activities3 on page54.
The sixth extinction
Two notable extinctions and their consequences
The number of extinctions that have occurred so far
Meaning of extinction:
Activity 3 Background information
1. What did scients find out in 2015
Activity 4 causes
Read para. 2 carefully and anwser following questions
2. Why does the writer think the sixth etinction will come
They found that human activity is causing species to die out 1,000 times faster than normal.
Because human activity has negatively affected all other species on Earth, including animals and plants.
Activity 5 Consequenses
Why does the writer believe we will probably die out if 75% of the Earth’s species die out
Read para. 3 carefully and anwser following questions
Because our world and our lives depend on the balance in nature between animals and plants.
Activity 6 Solutions
Read para. 4 arefully and anwser following question.
How to avoid the sixth mass extinction
Change the way we live: take steps to save endangered species; change how we work and travel by using cleaner, more natural sources of energy; improve our farming methods.
The Sixth Extinction
background information
causes
consequences
Solutions
meaning of extinction
number of times
two notable extinctions
reasons for extinctions
Activity 5
Activity 7
Summary
Read the other paragraphs and complete the whole textual structure with a mindmap.
Activity 7
Read the other paragraphs and complete the whole textual structure with a mindmap.
The Sixth Extinction
background information
meaning of extinction
number of times
two notable extinctions
reasons for extinctions
causes
Solutions
consequences
Summary
1.volcanic eruptions
2. asteroids
3. changing sea levels
4.decrease of the oxygen content of the sea
5. global warming
Air and wate pollution
Forests being destoryed
Factory farming
Overfishing
3/4 species die out
Balance broken in nature
humans die out
change the way we live
Take steps to save endangered species
Improve farming methods
Enjoy a fantastic song named Earth Song which is from Michael Jackson, and think how should we do to protect the Earth
Discussion
Activity 8
put rubbish into separate dustbins
cycle or take public transportation
use fewer plastic bags while going shopping
reduce waste
plant more trees
buy shopping bags
Homework
Level-A
Figure out writing techniques that the author use to emphasize the seriousness of the problem.
Level-B
Polish the structure diagram and write a summary about the Sixth Extinction with searching and complement more information about it.
Thank You