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 i
deas about how life began on earth.
In Chinese culture…
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.
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
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
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 _____
fire and _____ rock it exploded loudly with _____
the earth ’s atmosphere ___________
cooled down the earth ______
According to the pictures, have a try to retell the development of life.
A cloud of energetic dust 4
A solid ball
Explode with fire and rock
dissolve harmful gases
A world full of water
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.
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.
1. Read the passage more after class. 2. Write a composition about how to stop global warming.