Unit 4 Astronomy: the science of the stars

How life began on the earth?

Do you know each religion or culture has its own ideas about the beginning of the universe? Please give an example if you know.

Pre-reading

The beginning of the life

Pangu separates the sky from the earth. 盘古开天

Nvwa makes human beings. 女娲造人

God created man.

上帝创世说

Para1

Big Bang

atoms ____________

and________ to ____ stars and other bodies

begin to form

create

According to a widely accepted theory,the universe began

With________

combine

Paragraph 1:

Paragraph 2:

Paragraph 3:

Paragraph 4:

Paragraph 5:

D.How the plants and animals on the earth developed.

C. How the earth formed.

A. How humans appeared and what effects they have caused to the earth.

B. Water is very important for life on the earth

E.It is widely accepted that universe began with a “Big Bang”

Read quickly and match the main idea of each paragraph

Main idea:

The text mainly tells us the __________ of the earth and the _____________ of life in it.

formation development

True (T) or False (F).1. The earth appeared before the Big Bang happened.2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Mammals appeared before the development of dinosaurs.5. Dinosaurs could give birth to young baby animals and produced milk to feed them. 6. Human beings produce too much carbon dioxide which causes the global warming on the earth. 7. According to the text, human beings would disappear in the end.

F

F

T

F

F

F

T

Time The earth

As the earth cooled down

Several billion years after the “Big Bang”Between 4.5 and 3.8 billion years ago

A cloud of dust

A solid globe

Exploded with fire and rock

Water began to appear

Produce C/N water vapor, etc.

Stage1 The formation of the earth Para1-2

Why is water so important for the beginning of life?

Because water allowed the earth to diss

olve harmful gases into oceans and seas.

Para3

Stage2 The development of life

Para 4-5

Read para4 and fill in the blanks

45

678910

small plants in water

insects

reptiles

amphibians

mammalsdinosaurs

humans

plants animals

Green plants on land

forests

Shellfish and all sorts of fish

3

21

Put the order of development of life into a timeline according to the reading passage.

1. Insects and amphibians appeared.

3. The earth became a solid ball.

5. Reptiles appeared.7. The earth was a cloud of

dust.9. Shellfish and other fish a

ppeared.11. Clever animals with ha

nds and feet appeared.

2. Dinosaurs appeared.4. Small plants grew on the

water.6. Plants began to grow on d

ry land.8. Water appeared on the ea

rth.10. The universe began with

a "Big Bang".12. Mammals appeared.

10 7 3 8 4 9 6 1 5 2 12 11 人类的进化过程.flv

1.Who are the small clever animals with hands and feet?

2. Are they taking good care of the earth? Why?

Para5

Because they are putting too much carbon dioxide into the atmosphere.

The earth may become too hot to live on .

Prevent heat from escaping from the earth into space

The earth is becoming hotter and hotter!

Whether life will continue on the earth depends on human beings.Only if ( 只要 )we care will we help,

only if we help shall all be saved!

.