Unit 4 Astronomy: the science of the stars

Step 1 Warming up Do you know how many planets circle around the sun in our solar system ? What are they? Can you match the names with the planets?

Jupiter Uranus Neptune Saturn Mercury Mars Earth Venus 水星 金星 地球 火星 木星 土星 天王星 海王星

Solar system

Do you know each religion or culture has its own ideas about the beginning of the universe?

Pangu separates the sky from the earth

The development of the life breathwinds and clouds voice thunder left eye the sun right eye the moon blood the rivers veins the roads

Nuwa makes human beings

Other legends about the beginning of universe

Day 1: God spoke and separated light from darkness creating Day and Night Day 2: God spoke and separated the water creating sky and ocean Day 3: God spoke and created dry land 上帝创世说：

Day 4: God spoke and created the sun, moon and stars Day 5: God spoke and created living creatures in the air and sea Day 6: God spoke and created the land animals and man Day 7: God rested and blessed this day calling it Holy

Look at the picture in the text, try to guess: What’s the main idea of the text? A. how did water begin? B. how did earth begin ? C. how did man begin ? D. how did life begin ?

Para. 1 (A)The formation ( 形成 ) of the earth. Para. 2 (B)The importance of water for life. Para. 3 (C)A widely accepted theory about the formation of the universe. Para. 4 (D)The arrival of humans and their impact on the earth. Para. 5 (E)The development of plants and animals on the earth.

Careful reading Task 1 ： Read para 1 and answer the following questions. 1.According to a widely accepted theory, how the universe began? 2.After the “Big Bang” what began to form? The universe began with a “Big Bang”. After that, atoms began to form and combine to create stars and other bodies.

The Big Bang

Task 2 ： Read para 2 and fill in the blanks. For several billion years after the _________,the earth was still just ______________.Between __and_________ years ago when the dust settled into_____________. It exploded loudly with ____and____. They produced some gases, which were to make the earth’s __________. As the earth cooled down, _______ began appear on its surface. Big Bang a cloud of dust4.53.8billion a solid globe firerock atmospher Water

Task 3 ： Read para 3 and answer the question. Why did scientist believe water is fundamental to the development of life? Because water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it possible for life to develop.

Small plants in water Shellfish and all sorts of fish Green plants on land Insects (on land) Amphibian (on land and in water) Forests Reptiles (on land) Dinosaurs (on land) Mammals (on land) The development of lifedevelopment Paragraph 4

water Plants in the water Shellfish and fish Plants on land Insects and amphibians Reptiles Dinosaurs Mammals

（ ） A Insects and amphibians appeared. （ ） B Dinosaurs appeared. （ ） C The earth became a solid ball. （ ） D Small plants grew on the water. （ ） E Reptiles appeared. （ ） F Plants began to grow on dry land. （ ） G The earth was a cloud of dust. （ ） H Water appeared on the earth. （ Shellfish and other fish appeared. （ ） J The universe began with a “Big Bang”. （ ） K Clever animals with hands and feet appeared. （ ） L Mammals appeared ）6） Detailed reading Put the order of development of life into a time line

Read the last paragraph again, answer the following question After the human beings appearad, what did they do to the earth?

Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. The earth may become too hot to live on.

How to protect the earth and make it a better place to live on?

solar energy plant trees recycle rubbish prevent desertification save water purify air What can we do take care of the earth?

plant trees save water save paper join Earth Hour ride bikes or take buses or walk to school use recyclable products reduce rubbish save electricity

Only if we understand can we care; 唯有了解，我们才会关心。 Only if we care will we help; 唯有关心，我们才会行动。 Only if we help shall all be saved. 唯有行动，生命才会有希望。 ----Jane Goodall —— 珍妮 古道尔

We have only one earth! We should take care of the earth! ks5u 精品课件