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how life began on the earth公开课课件


Unit 4 Astronomy: the science of the stars

We live on the same planet — the earth

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.

In Chinese culture…

sky

earth Pangu 盘古 separates(分) the sky ____________ from the earth.

_____________ Nuwa (女娲) made human beings.

In western countries:
God (上帝) ______________ created

the world and all living things.

Pre-reading

Do you know what a scientific idea is?
Background knowledge The Big Bang is the term used to describe a huge explosion that scientists 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.

How life began on the earth
While-reading
Step 1. Fast reading

Read the passage on P25 quickly, and match the right main idea of each paragraph. How many parts can the text be divided into?

Para.1 The importance of water for life Para.2 A theory about how the universe was formed

Para.3 The formation(形成) of the earth
Para.4
Part1: The development of the earth The arrival of humans and their effects on the earth

Para.5 The development of plants and animals
Part2:The development of life.

( 2 ) Detailed Reading

Part 1(1~3): The development of the earth

Part1 (para1~3) The development of the earth

How did the earth come into being? (1) After the Big Bang, what happened? (2) What happened to the solid globe next? (3) What did the water vapour and gases were to make? (4) What appeared after the earth cooled down? (5) What did the water do?

(1) After the Big Bang, what happened?

a cloud of dust Settled into a violent solid ball

(2) What happened to the solid globe next?

exploded with In time produced water vapour and gases fire and rock

(3) What did the water vapour and gases were to make?

the earth’s atmosphere

(4) What appeared after the earth cooled down?

Water appeared on its surface which is important for the beginning of life on the earth.

(5) What did the water do?

It allowed the earth to dissolve harmful gases and acids into the oceans and seas.

How did the earth come into being(产生)?
Big Bang a solid _______ ball/globe

dust a cloud of _____
slowly combine

fire and _____ rock it exploded loudly with _____
the earth ’s atmosphere ___________

cooled down the earth ______

water

According to the pictures, have a try to retell the development of life.

1

Combine into

2

A cloud of energetic dust 4
Cool down

A solid ball
Explode with fire and rock

3

dissolve harmful gases

A world full of water

Atmosphere

Part 2 (4~5) The development of life

Part2 (para4~5) The development of life

Read para4 carefully and make a timeline of the development of life

1. a timeline of the development of life water
1. small ________ plants in water

shellfish and all sorts of fish _________ 2.
11.

green plants on land 3. small clever animals 10. hands and feet with ______________
4. insects (on land) ___________(on amphibians land and in water) 5.
6. forests 7._________ reptiles (on land) 8. dinosaurs (on land) mammals (on land) 9._________

the cleverest animals

The arrival of ___________ small plants encouraged the development shellfish and all sorts of fish ____________of early ________________________. Many millions of years later __________________ the first green plants began to appear _________. on land Later ____________ land animals insects Others called appeared. Some were________. __________, amphibians were able to live on lands well as __________. in the sea When the plants grew into forests, dinosaurs _________appeared for the first time. After they disappeared, _________became more important. mammals They were the last group of animals different produced from because they _________milk from within their bodies.

Read pare5 carefully .find out the answer. 1. What problem is caused by human being?

They caused global warming.

The earth is getting warmer each year.what effects will this have? How to solve this problem?

Suggested Answers: The earth will be so hot that no life will exist(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, control the population and so on .

We only have one earth. Without other livings ,we human cannot live.

Homework
1. Read the passage more after class. 2. Write a composition about how to stop global warming.


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