必修3第四单元课件

1、Astronomy: the Astronomy: the science of the starsscience of the starsUnit 4Unit 4Warming up Do you know how many planets circle around the sun in our solar system?In our solar system eight planetscircle around the sun. 1111THE SOLAR SYSTEM Can you name each planet correctly using the letters given

2、in the table below? A.地球地球 _B. 木星木星 _C.火星火星 _D.水星水星 _E. 海王星海王星 _F. 冥王星冥王星 _G. 土星土星 _H. 天王星天王星 Uranus_I. 金星金星 Venus_EarthJupiterMarsMercuryNeptunePluto(x)SaturnMy Very Excellent Mother Just Sent Us Nine PizzasHow to remember the order of the eight planets around the sun?EarthJupiterMarsMercuryNeptune

3、SaturnUranusVenus Each religion and culture has its own ideas about how life began on the earth. 中国神话传说中有盘古开天地的说法。中国神话传说中有盘古开天地的说法。巨人盘古用一把利斧劈开混沌巨人盘古用一把利斧劈开混沌,将天地分开。将天地分开。死后死后,他的气息化成风和云他的气息化成风和云,声音变成轰轰的声音变成轰轰的雷声雷声,左眼化为太阳左眼化为太阳,右眼化为月亮右眼化为月亮,手足与四手足与四肢变成大地的四极与五方的名山肢变成大地的四极与五方的名山,血液化成血液化成江河江河,筋脉铺成道路筋脉铺成道

4、路,肌肉形成田地肌肉形成田地,须发成为须发成为星星星星,牙齿和骨骼化为金属、珍珠、玉石牙齿和骨骼化为金属、珍珠、玉石,汗汗水成为滋润万物生长的甘霖和雨露。水成为滋润万物生长的甘霖和雨露。Chinese Legends Pangu separates the sky from the earth.Legend: The Goddess Nuwa mended the heaven and created human beings from the clay(粘土粘土).Religious BeliefAccording to Bible, God created the world in 7 d

5、ays.Day 1: God created Day and Night.Day 2: God created sky.Day 3: God created dry landthe earth, and seas.Day 4:God created two great lights (the sun, the moon) and stars.Day 5: God created living things in the air and sea.Day 6: God created the land animals and the first man.Day 7: God rested and

6、called this day Holy.How Life Began on the EarthHow Life Began on the EarthListen and match1. Listen to the passage and match each paragraph with its main idea. 2.Tell the main idea of the text in one sentence. Paragraph 1Paragraph 1 Paragraph 2Paragraph 2 Paragraph 3Paragraph 3 Paragraph 4Paragraph

7、 4 Paragraph 5Paragraph 5 A. How humans appeared and whatA. How humans appeared and what effects they have caused to the effects they have caused to the earth. .earth. . B. Water is very important for life B. Water is very important for life on the earth. on the earth. C. How the earth formed.C. How

8、 the earth formed. D. How the plants and animals on the D. How the plants and animals on the earth developed. earth developed. E. It is widely accepted that the E. It is widely accepted that the universe began with a “Big Bang”. universe began with a “Big Bang”.Paragraph 1Paragraph 1Paragraph 2Parag

9、raph 2Paragraph 3Paragraph 3Paragraph 4Paragraph 4Paragraph 5Paragraph 5A.A.How humans appeared and what How humans appeared and what effects they have caused to the effects they have caused to the earth. .earth. .B. Water is very important for lifeB. Water is very important for life on the earth. o

10、n the earth.C. How the earth formed.C. How the earth formed.D. How the plants and animals on the D. How the plants and animals on the earth developed. earth developed.E. It is widely accepted that the E. It is widely accepted that the universe began with a “Big Bang”. universe began with a “Big Bang

11、”. The text mainly tells us the formation of the earth and the development of life on it.Careful readingRead the passage carefully and answer the following questions1. What was there on the earth before life could begin? Water vapour, carbon dioxide, oxygen, nitrogen and other gases.2. Why do scient

12、ists think there has never been life on the moon? Because there is no water on the moon.3. Why did animals first appear in the seas? Because water allowed the earth to dissolve harmful gases into the oceans and seas. 4. Why did green plants help life to develop? Because green plants can take carbon

13、dioxide from the atmosphere and fill the air with oxygen.5. Why were mammals different from other animals? They were different because they produced their young from within their bodies.Detailed ReadingThe development of the earthThe development of the earthStage 1: The development of the earth1) Af

14、ter the Big Bang, what happened? a cloud of dust a violent solid globe exploded with fire and rockproduced carbon,nitrogen ,water vapour& gases(2) What happened next?(3) What did the water vapour and gases form?the earths atmosphereWater appeared) 4) What appeared on the earth then?(5) What did

15、the water form?oceans and seasThe development of lifeThe development of lifeextremely small plants Firstearly shellfishStage 1: The development of life in waterall sorts of fish green plants on land insects on landStage 2: The development of life on land Nextamphibians on land and in the waterGreen

16、plants grew into forests Later reptiles on land dinosaurs on land(1) What life developed after forests appeared?After thatmammals on land2) What life developed after dinosaurs? small clever animals(3) What life developed after mammals? Finally1. Big Bang2. a cloud of dust3. A solid globe4. exploded

17、with fire and rock5. produce the water vapour, carbon dioxide-atmosphereHow did the earth come into being?6. cooled down7. water appeared8. Dissolved harmful gases &acid （ ）1 Insects and amphibians appeared. （ ）2 Dinosaurs appeared. （ ）3 The earth became a solid ball. （ ）4 Small plants grew on t

18、he water. （ ）5 Reptiles appeared. （ ）6 Plants began to grow on dry land. （ ）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 appeare

19、d.875）64110392 Put the order of development of life. 12 11 Summary The universe began with a “B_”. The earth was a cloud of dust.The earth became a solid ball then it e_ with fire and rock.They produced carbon and other gases, which made the earths a_.When it cooled down, water appeared on the s_.Th

20、en small green p_grew on the water, and later shellfish and other fish appeared.ig BangxplodedtmosphereurfacelantsSummary When plants began to grow on dry land, insects and a_appeared.Forests appeared before r_appeared .They produced young by l_eggs.Then d_ appeared in forests.The disappearance of d

21、inosaurs made the rise of the animals called “ m_”.At last small clever animals appeared , and later they grew into h_beings.inosaursayingmphibianseptilesammalsumanPost readingDiscuss the following questions.1. Why was the earth different from the other planets?3. Why is it wrong to show films with

22、dinosaurs and people together?2. Why did the plants grow before the animals came?Because the water remained on the earth.Because dinosaurs died out long before human beings developed on the earth.Because plants provided oxygen for animals to breathe.4. There used to be nine planets in the solar system. Recently scientists have dec