howlife-began-on-theearth公开课PPT课件

Shorten the text to present the main idea in around 100 words after class.
made the atmosphere
cooled down
water appeared
2.2 Try to sort out the lower words of life based on Para. 4 and 5.
3. What is the real intention of the author’s writing?
A
B C D
1E
F
Hale Waihona Puke HIJ1E
2J
3F
4A
5I
8G 9C
7B
6H
10D
II. Thinking & inquiring
1. Summarize a heading for each paragraph
Para. 1 Para. 2 Para. 3 Para. 4 Para. 5
the origin/formation of the universe the origin/formation of the earth the importance of water for life the development of life on the earth humans’ influence on the earth
III. Sharing and expressing
Discussion: What do you think of the statement of “water is the source of life”? Do you agree with it? Why or why not?

[,fΛndə'mentl] Water was to be fundamental to the development of life. be base on
Water allowed the earth to dissove hurmful gases and acids into the oceans. This produced a chain reaction,which made it possible for life to develop.
God created the world in seven days
Some legends about the beginning of universe.
What is the scientific theory about the beginning of life on the earth?
Topic: _H_o_w__L_if_e_B__eg_a_n__o_n__th_e earth
Key words: 1.___a_ir_______ 2.__w_a_t_e_r _____
3.__p_l_an_t_s____ 4.___a_n_im_a_l_s___
Water is the headspring of life.
['reptail]
Reptiles produced young generallyby
laying eggs
['mæməl] Mammals like monkeys gave birth to young baby animals and produced milk to feed them.
The Big Bang
A cloud of dust

atmosphere
water appeared
Cool down
dissolve harmful gases into …
Part 2:The development of life
Read para4 carefully and make a timeline of the development of life
The development of plants and animals
. Part2:The development of life
Main idea:
The text mainly tells us the formation (form) of the earth and the development (develop)of life on it.
beginning of the universe?
Big Bang
Skimming
➢How many parts can this text be divided into? ➢In what order is this text written?
This passage can be divided into two parts: Part 1 (para1-3): The development of earth. Part 2(para4-5): The development of life. life in the water life on the land
人民教育出版社必修三第四单元 How Life Began On The Earth
Read the title and look at the pictures on the book. Predict what the reading will be about.

New words
The universe began with a “Big Bang”.---The Big Bang Theory
What is the most widely accepted theory about the universe?
Para2: The development of the earth Stage 1: The development of the earth (1) After the Big Bang, what happened?
Explode…with fire & rock
(produce H2O, CO2,O2, N2, other gases)
Cool down
atmosphere
water appeared
Life began and developed
plants-------
animals
Careful-reading
a cloud of dust
a violent solid ball
(2) What happened next?
exploded with fire and rock
produced water vapour and gases
A cloud of dust Combine into a solid ball
reptiles on land
dinosaurs on land
Stage 3: The development of life on land (4) What life developed after dinosaurs?
mammals on land
Stage 4: The development of humans (2) What life developed after mammals?