Unit4_Astronomy.ppt

1、,Astronomy: the science of the stars,Unit 4,In our solar system eight planets circle around the sun.,1111,The Solar System,地球 _ 木星 _ 火星 _ 水星 _ 海王星 _,F. 土星 _ G. 天王星 _ H. 金星 _,Earth,Jupiter,Mars,Mercury,Neptune,Saturn,Uranus,Venus,The Solar System,Can you name the eight planets?,Lets appreciate some b

2、eautiful pictures of the solar system.,Total lunar eclipse (月全食),Total solar eclipse (日全食),Meteor rain (流星雨),Comet (彗星),How did life begin on Earth?,How was the universe formed?,The universe began from the Big Bang.,Life first began in the sea on the earth.,Study of the groups of life (種類/物種) Look a

3、t the pictures and tell the groups.,plants,reptiles (爬行類),shellfish (貝類),fish,insects,mammals,amphibians (兩棲類),Skimming to get general ideas,Reading Comprehension I,Who knows exactly how the earth began? A. Scientists. B. Astronomers. C. No one. D. Aliens (外星人). 2. What does “small clever animals” r

4、efer to? A. Insects. B. Reptiles. C. Dinosaurs. D. Humans.,Skimming,Read the passage quickly to find the main idea of each paragraph.,Paragraph 1: A widely accepted theory about the formation of the universe Paragraph 2: The formation of the earth Paragraph 3: The importance of water for life Paragr

5、aph 4: The development of plants and animals on the earth Paragraph 5: The arrival of humans and their impact on the earth,Scanning to get detail information,1. The earth was different from the other planets in that _. A. a cloud of dust was around the earth B. comfortable climate remained on the ea

6、rth C. water remained on the earth D. carbon remained on the earth,Reading Comprehension II,Scanning,2. The plants grew before the animals because they provide _. A. nutrients for animals to absorb (吸收) B. oxygen for animals to breathe C. necessary temperature for animals to keep warm D. water vapou

7、r for animals,3. Which of the following statements is true? A. The dust settled into a solid globe between 4.5 and 3.6 billion year ago. B. The first small plants began to appear on the surface of the land. C. About 2.6 million years ago some small clever animals appeared and spread in the ocean. D.

8、 Dinosaurs died out long before human beings developed on the earth.,Put the order of development of life into a timeline. Use the reading passage to help you. (P.27: 2),1 Insects and amphibians appeared. 2 Dinosaurs appeared. 3 The earth became a solid ball. 4 Small plants grew on the water. 5 Rept

9、iles appeared. 6 Plants began to grow on dry land.,Reading Comprehension III,Scanning,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.,Ans

10、wer: 10 7 3 8 4 9 6 1 5 2 12 11,Detailed Reading,The development of the earth,Stage 1: The development of the earth,(1) After the Big Bang, what happened?,a cloud of dust,a violent solid ball,exploded with fire and rock,produced water vapour and gases,(2) What happened next?,Water appeared which is

11、important for the beginning of life on the earth.,(3) What appeared on the earth then?,(5) What did the water do?,It allowed the earth to dissolve harmful gases and acids into the oceans and seas.,extremely small plants,What life developed after water appeared?,Stage 2: The development of life in water,all sorts of fish,(2) What life developed in water next?,early shellfish,green plants on land,(3) What life developed after the life in water?,insects on land,amphibians on land and in the water,forests,Stage 3: The development of life on land,(1) What life developed next