Unit 4 Astronomy: the science of the stars

Universe

海王星 Neptune

水星Mercury

金星Venus

地球Earth

火星Mars

木星Jupiter 土星

Saturn

天王星Uranus

Solar system

Different legends about the beginning of the universe

Do you know these stories? Give an example,

please.

Pangu separates the sky from the earth

Nuwa mending the sky

Holy Bible believed that God created the universe

• Then the god created the first man and the first woman Adam and Eve(亚当和夏娃）

What’s the scientific theory about the beginning of the universe ?

Skimming: Read the first sentence(or the second when necessary) of each paragraph and try to summarize the main idea.

Para. 1. A widely accepted ________ Para. 2 The _____________ of the earth Para. 3The ____________ of water for life.Para. 4. The _____________ of plants and animals on the earth.Para. 5 The ________ of humans and their ________ on the earth

theoryformation

importance

development

arrivall

impactt

Read para2-3 and answer questions

• 1. What did the earth look like after the “Big Bang”?

• 2. What happened to the earth between 4,5 and 3.8 billion years ago?

• 3. What is included in the atmosphere of the earth?

• 4. How did water come into being on the earth?

• 5. why was water important ?

for several billion years after “Big Bang”between4.5 and 3.8 billion years agoWhat happened on the earth at that time?what did the explosion produce?

A cloud of dust

settled into a solid globe

Exploded…with fire & rock

(produce C, N2, H2O, and other gases)

madeatmospherewater appeared

Cool down

Life began on the earth

What did the water do on the earth?dissolve harmful gases and acids into …

The formation of the earth

Read paragraph 4 and 5, and finish the form

The words that suggest the time order

The development of life

plants animals

Many millions of years later

  small plants on the water

5.

1. 6. 7.

Later 8. 9.

2.  / 10.

3.  / 11.

4. / human

  shellfish & other fish

Next insects and amphibians

the plants grew into forests reptiles

mammals65 million years ago

After that dinosaur

Finally, about2.6 million years ago

Green plants began to grow on land

what kind of life form appeared first?small plants on the watershellfish & other fish

Green plants began to grow on landinsects and amphibians

can live on land and in the waterthe plants grew into forests

reptiles lay eggsthe age of dinosaurs

mammalsgive birth to young baby animals

clever animals

1. Why did the plants grow before the animals came?

2. Why is it wrong to show films with dinosaurs and people together?

Pair-work

Because plants provide oxygen and food for animals.

Because dinosaurs died out long before human being developed on the earth.

Put the order of development of life intoa timeline. Use the reading passage to help you.

1 Insects and amphibians appeared.2 Dinosaurs appeared. 3 The earth became a solid ball.4 Small plants grew on the water.5 Reptiles appeared.6 Plants began to grow on dry land.

consolidation

7 The earth was a cloud of dust.8 Water appeared on the earth.9 Shellfish and other fish appeared.10 The universe began with a “Big Bang”.11 Clever animals with hands and feet appeared.12 Mammals appeared.

Answer: 10 7 3 8 4 9 6 1 5 2 12 11

Thinking: What problem are these clever animals causing?

They are putting too much CO2 into the atmosphere

What will happen when we put too much CO2 into the atmosphere? greenhouse effectglobal warming

animals will die outplants will die out

There will be no life on the earth

rise of the sea level

icebergs and glaciers melt

How to reduce global

warming and make the earth a

better place to live on?

• What we can do is to• stop putting too much carbon dioxide

into the air • reduce pollution• control the population • Plant more trees to absorb the heat• …

One Earth, One HomeHeal the worldMake it a better placeFor you and for me and the entire

human race

How life began on the earth.

“Big Bang”

other bodies___________stars

Earth: a cloud of _____

atoms

dust

Summary

a solid ______

the earth’s ___________

other ____

_

Water: ___________ to the development of life

water vapour nitrogen carbon

extremely small _______ on the surface of the water

globe

gases

atmosphere

fundamental

plants

early _________ and all sorts of fish

green plants on land

land animals

insects

amphibians

________

huge animals (dinosaurs) the rise of

__________

human beings

shellfish

reptiles

mammals