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(共25张PPT)
The natural world
Unit 7
Reading
Learning Objectives
By the end of this lesson, we will be able to：
1. grasp key facts like coverage, ecological roles, and metaphorical descriptions of oceans, wetlands, and forests;
2. enhance English reading skills, including extracting information from text and matching to visual aids;
3. raise environmental awareness and understand the significance of ecosystem protection.
Watch and answer
How are these ecosystems like human organs
Look and say
1 What kind of things do you think are in an ecosystems
2 What do you know about oceans, wetlands and forests
An ecosystem includes all the living and non-living things in an area. Ecosystems can be of different sizes, from small ponds to large grasslands. Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment.
The ocean is a very large ecosystem on earth. It covers around 71% of the earth’s surface and produces about 70% of the earth’s oxygen. It holds plenty of salt water, and the water rises to the sky, falls onto the lands and then returns to the ocean. This goes on and on, so the ocean is just like the “heart” of the earth.
Wetlands only cover about 6% of the earth’s land area. But they are home to about 40% of all the types of plants and animals. Plants in wetlands help get rid of pollution and make the water clean. Wetlands can also help prevent floods. During heavy rains, wetlands store water like huge sponges. They act like the “kidneys” of the earth.
Forests make up nearly a third of the earth’s land area. Plants there take in carbon dioxide from the air and produce oxygen.They also trap harmful things in their leaves and help clean the air. Therefore, people often call forests the “lungs” of the earth.
Each of these ecosystems supports millions of plants and animals. They keep the planet healthy and make our world a better place.
Reading for the structure(结构).
What's the structure of the text
How many paragraphs（段落） are there
C. Ecosystems Sustain Life
B. What is an Ecosystem
A. Forests: Earth’s Lungs
E. Wetlands: Earth’s Kidneys
Reading for the key words(关键词).
D. The Ocean: Earth’s Heart
A. Look at the picture and choose the correct descriptions for each ecosystem according to the article. Write the correct letters in the boxes.
a Cover 71% of the earth’s surface
b Cover nearly a third of the earth’s land area
c Help clean the water
d Help make the air clean
e Help prevent floods
f Produce about 70% of the earth’s oxygen
g The “heart” of the earth
h The “lungs” of the earth
i The “kidneys” of the earth
a f g
- a: “covers around 71% of the earth’s surface” P2
- f: “produces about 70% of the earth’s oxygen” P2
- g: “the ocean is just like the ‘heart’ of the earth” P2
c e i
- c: “Plants in wetlands help get rid of pollution and make the water clean” P3
- e: “wetlands can also help prevent floods” P3
- i: “They act like the 'kidneys' of the earth” P3
b d h
- b: “Forests make up nearly a third of the earth’s land area” P4
- d: “Plants there... help clean the air” P4
- h: “people often call forests the ‘lungs’ of the earth” P4
1. What is an ecosystem made up of
a Oceans, wetlands and forests.
b Plants and animals.
c Living and non-living things.
2. Why is the ocean the largest ecosystem of the three
a It holds plenty of the earth’s water.
b It makes up about 71%of the earth’s surface.
c It is home to many kinds of plants and animals
3. What do wetlands do during heavy rains
a They make the water clean.
b They hold water.
c They get rid of water.
4. “They also trap harmful things in their leaves and help clean the air.” Which word can we use to replace the word “trap”
a keep b drive c produce
5. Where can we read this kind of article
a In a newspaper
b In a travel guide.
c In a geography magazine.
B. Read the article again. Choose the correct answers to the questions.
An ecosystem includes all the living and non-living
things in an area."
The ocean covers around 71%
of the earth’s surface.”
“During heavy rains, wetlands store water like giant sponges.”
“Trap” here means pollution is captured and held in leaves. “Keep” fits best.
The article explains scientific facts about ecosystems, typical of geography or science magazines.
balance be home to surface oxygen get rid of take in store role
C. Simon is listening to a podcast about the ocean plete
the script with the correct forms of the words and phrases in the box below.
The biggest ecosystem
Hello listeners! Welcome to Science with Doctor Ted. Today I’ll talk to you about the biggest ecosystem on our planet.
Do you know what it is Yes, it’s the ocean. It covers the largest area of the earth’s (1)__________ and holds 97% of the earth’s water. It (2)____________________ many animals and plants.
Do you know that some of the plants in the ocean produce (3)_________________ for the animals
living there What’s more, the ocean can (4)_________________ 25%-30% of carbon dioxide and
(5)__________ heat. It plays an important (6)______________ in slowing down climate change.
Sadly, we’re facing a serious problem: ocean pollution. There are millions of tons of plastic in the ocean and it’s very difficult to (7)______________ it. It’s time for us to take action and protect the ocean. If we don’t, the plastic will harm the (8)______________ ocean ecosystem .
surface
is home to
oxygen
take in
store
role
get rid of
balance
Think about the questions below. Share your answers with your classmates.
1. Why are the three ecosystems important for the earth
The oceans covers around 71% of the earth’s surface and produce about 70% of the earth’s oxygen. It hold plenty of salt water and play a key role in the water cycle, acting like the “heart” of the earth.
Wetlands are home to about 40% of all the types of plants and animals. They help get rid of pollution, make water clean, and prevent floods, acting like the “kidneys” of the earth.
Forests make up nearly a third of the earth’s land area. They take in carbon dioxide from the air and produce oxygen, trap harmful things in their leaves and help clean the air, so people call them the “lungs” of the earth. All three ecosystems support millions of plants and animals and keep the planet healthy.
Think about the questions below. Share your answers with your classmates.
2. What are some of the non-living things in an ecosystem Are they important Give reasons.
Water is essential for all living things. In oceans, it provides a habitat for marine life and is a key part of the water cycle. In wetlands, it helps with pollution removal and flood prevention. In forests, it is necessary for plant growth.
Air contains oxygen that living organisms need to breathe. In forests, plants take in carbon dioxide from the air and release oxygen.
Soil provides nutrients for plants to grow. In forests, it supports the root systems of trees, and in wetlands, it is part of the environment where plants and animals live.
Think about the questions below. Share your answers with your classmates.
3. How do human activities affect the ecosystems Give an example.
Human activities can negatively affect ecosystems. For example, deforestation. Humans cut down trees in forests for timber, agriculture, or urban development. This reduces the area of forests, which means there are fewer trees to take in carbon dioxide and produce oxygen. It also destroys the habitats of countless plants and animals that live in the forests, disrupting the balance of the forest ecosystem.
Retell
Earth's Vital Organs: Ocean, Wetlands & Forests
Ecosystem Metaphor Key Data Critical Function Major Threats
Ocean Earth’s Heart Covers 71% surface
Produces 70% oxygen Water cycle hub
Climate regulator Plastic waste
Overfishing
Wetlands Earth’s Kidneys 6% land area
Home to 40% species Water filtration
Flood prevention Land reclamation
Pollution
Forests Earth’s Lungs 1/3 land area
Absorbs CO Oxygen production
Carbon storage Deforestation
Wildfires
According to the chart, please retell the article.
Check your presentation
Present your poster to the class.
language correct form(形式正确)
accurate meaning(意义精确)
proper use(使用恰当)
poster design creativity(创意)
performance confidence(自信)
OK Good Excellent
To treat the earth kindly is
to treat oneself kindly.
play a role 动词词组，意思是发挥作用；扮演角色
常见搭配：play an important role in...（在......中起重要作用）
play the role of...（扮演......的角色）
常见例句：
Wetlands play an important role in maintaining
ecological balance.
湿地在维持生态平衡方面起着重要作用。
1. Each ecosystem has a role to play...
plenty of: 大量的;充足的 词性: 形容词短语
常见搭配：
plenty of time/water/resources（充足的时间/水/资源）
have plenty of...（有大量的......）
常见例句：
Wetlands act like natural water purifiers.
湿地就像天然的净水器。
2. The ocean holds plenty of salt water...
act like: 表现得像; 起......作用 词性: 动词短语
常见搭配:
act like a filter (起到过滤器作用)
act like a sponge (起到海绵作用)
常见例句：
She makes some progress in her piano skills.
她在钢琴技巧上取得了一些进步。
3. They act like the kidneys of the earth.
Wetlands __________ pollution to keep water clean.
Forests __________ carbon dioxide and __________ oxygen.
The ocean __________ salt water and __________ the earth’s heart.
Read and choose
store/take in/act like/get rid of/trap
get rid of
take in
produce
stores
acts like
Emma: Did you know wetlands are called Earth’s “kidneys”
Liam: Really Why
Emma: Because they (1) ________________________ like sponges during heavy rains and (2) __________________________________. (Hint: 2 functions)
Liam: Wow! How much of Earth do they cover
Emma: Only (3) ______%, but they’re home to (4) ______% of species!
Complete the conversation using information from the text.
store water
filter pollution / make water clean
6
40

For: _____________________________________________________
Against: __________________________________________________
Protecting ecosystems is more important than jobs. Do you agree
Give ONE reason for AND against.
For:
Ecosystems give us things we ______ (need/can’t live without), like ______ (oxygen/food). If we destroy them, ______ (future generations will suffer).
Against:
Some people ______ (work in factories/farms) that harm nature. If these close suddenly, they can’t ______ (feed their families/pay bills).
Design a “Protect Earth’s Organs” flyer: Include text statistic and
some protection tips.
Basic homework
Practical homework
Create ecosystem function matching cards. Match oceans/wetlands/forests to their organ metaphors using text quotes.
Film an ecosystem services explainer video: Demonstrate in English how ecosystem works like a body organ.
Extended homework

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