astronomy的阅读课件.ppt

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1、How Life Began on the EarthPeriod 1What are the names of the eight planets that circle our sun?How Life Began on the EarthPeriod 1 eight planets many comets other objects 地球地球 _ 木星木星 _ 火星火星 _ 水星水星 _ 海王星海王星 _F. 土星土星 _G. 天王星天王星 _H. 金星金星 _EarthJupiterMarsMercuryNeptuneSaturnUranusVenusThe Solar SystemT

2、he Solar SystemCan you name the eight planets? JupiterUranusNeptuneSaturnMercuryMarsEarthVenus水星水星 金星金星 地球地球 火星火星木星木星土星土星天王星天王星 海王星海王星Quiz:1.Who wrote the book The Origin of Species (1.Who wrote the book The Origin of Species (物种起源物种起源) ?) ? A.Issaac Newton B .Albert Einstein A.Issaac Newton B .Albe

3、rt Einstein C. Charles Darwin C. Charles Darwin2. How many big 2. How many big planetsplanets are there in the Solar are there in the Solar System?System? A . 7 B .8 C. 9 A . 7 B .8 C. 9 3. Which one belongs to 3. Which one belongs to amphibian(amphibian(两栖物）两栖物）? ? A .frog B. snake C .dinosaur A .f

4、rog B. snake C .dinosaur 4. Which one belongs to 4. Which one belongs to reptilereptile（爬行物）（爬行物）? ? A. fish B .snake C .bird A. fish B .snake C .bird 7. On which planet are there lives 7. On which planet are there lives at present ? A. the Venus B .the Earth A. the Venus B .the Earth C. the Mars C.

5、 the Mars6. Which gas is the most important for life?6. Which gas is the most important for life? A. A. carbon dioxidecarbon dioxide (CO (CO2 2 ) B. ) B. oxygenoxygen(O(O2 2) ) C. C. nitrogennitrogen (N (N2 2) )5. Which one belongs to5. Which one belongs to mammal mammal （哺乳动物）（哺乳动物）? ? A. dinosaur

6、B. dog C. fish A. dinosaur B. dog C. fishDo you know each religion or culture has its own ideas about the origin of the universe or life? Pre-readingBig BangChinese Legends (传说传说) Pangu separates the sky from the earth.His whole body then turns into all kinds of things in the universe.Pangu separate

7、s the sky from the earth.Nvwa makes human beings.According to Bible (圣经圣经), God created the world and the first man, Adam (亚当亚当) and the first woman, Eve (夏娃夏娃). God created the world in seven days.Religious Beliefs God created the world in 6 daysScientific Theories ReadingHow life began on the eart

8、h?Fast reading1.What was fundamental to the development of life ?2.When did some clever animals appread on the earth?Para3 water Para5 2.6million years ago Para.1 Para.2Para.3Para.4Para.5A_ about how the universe was formedThe_ of the earthThe importance of_ for lifeThe_ of plants and animalsThe arr

9、ival of _ and their effects on the earththeoryformationwaterdevelopmenthumansCareful-readingBefore life appeared.Different lives developed.Paragraph 1:1. A1. A widely accepted theory was put up with. What widely accepted theory was put up with. What is it?is it? The universe began with a “Big The un

10、iverse began with a “Big Bang” that threw matter inall Bang” that threw matter inall directions. After that, atoms directions. After that, atoms began to form and combine to began to form and combine to create stars.create stars.waterPlants in the water Shellfish and fishInsects and amphibiansReptil

11、esDinosaursMammalsPlants on land （ ）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

12、. （ ）I Shellfish and other fish appeared. （ ）J The universe began with a “Big Bang”. （ ）K Clever animals with hands and feet appeared. （ ）L Mammals appeared.51062948371 Put the order of development of life into a time line. 12 11 Post readingTrue (T) or False (F).1. The earth appeared before the Big

13、 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. Life began in water and then on land.FFTTsummary After the “Big Bang”, the earth was just a cloud of _. It _ loudly with fire

14、 and rock, which were in time to produce the water _, carbon dioxide and other gases. Then small plants grew. They multiplied and _ the oceans and seas with oxygen. Many millions of years later the first green plants began to _ on land. When the plants grew into forests, _ appeared for the first tim

15、e. They produced young generally by _ eggs. when dinosaurs disappeared, _ became more important. Now small clever animals with _ appeared and _ all over the world. As time went by they covered the earth and they are putting too much carbon dioxide into the _, which _ heat _ the earth into space. Whe

16、ther life will continue on earth for millions of years to come will _ whether this problem can be solved.What problems have been caused by humans to the earth? solar energy plant trees recycle rubbish prevent desertificationsave waterclean airWhat can we do take care of the earth?Greenhouse effect(2) But they are not taking care of the earth very well. What problem are humans causing ?putting carbon dioxide into the atmospherethe earth may become too hotWhether life will continue on the earth depends on human beings.Only if we care will we help,only if we help shall all be saved!