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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