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1、Unit 4,the science of the stars,solar system太阳系,Sun,Venus,Mercury,Mars,Jupiter,Saturn,Earth,Pluto,Neptune,Uranus,But scientists now think Pluto is too small to be called a planet.,The names of eight planets.,MercuryVenusEarthMarsJupiterSaturnUranusNeptune,1) 水星2) 金星3) 地球4) 火星5) 木星6) 土星7) 天王星8) 海王星,N
2、uwa made humans.,Pangu separates the sky from the earth.,Other legends about the beginning of universe.,ReadingHOW LIFE BEGAN ON THE EARTH,Skimming,Whats the main idea of the passage?,The text mainly tells us the_of the earth and the _ of life on it.,formation,development,Conclude the main idea of e
3、ach paragraph.1) A widely _ about the _ of the universe.2) The formation of the _.3) The _ of water for life.4) The development of _ and _ on the earth.5) The arrival of _ and their _ on the earth.,theory,origin,earth,importance,plants,animals,humans,influence/ effect,Scanning,1. What is the origina
4、l earths atmosphere made up of? 2. What is the fundamental to the development of life, and why?3. Which kind of life-being first appeared on the earth, plants or animals?,Intensive reading,Read the passage quickly to answer the following questions.,carbon, nitrogen, water vapour,and other gases,2. w
5、hat is fundamental to the development of life?,Water.Because it allowed the earth to dissolve harmful gases and acids into the oceans and seas.,1. What is the original earths atmosphere made up of?,3. Which kind of life-being first appeared on the earth, plants or animals? Why?,At first, small plant
6、s began to appear on the surface of the water, and they produce oxygen, which encouraged the later development of early shellfish and all sorts of fish.,Can you fill in the blanks?,2,3,45,6,78910,1 small plants in water,shellfish and all sorts of fish,insects,reptiles,amphibians,mammals,dinosaurs,hu
7、mans,plants,animals,Green plants on land,forests,Lets review the evolution of life on the earth.,1. Big Bang,How did the earth come into being?,We have only one earth!,We are making the world better.,We are making the world worse.,A,B,Discussion,developed new methods of growing food,(1) What humans
8、developed?,developed new methods of hunting,developed new methods of moving around,(2) But they are not taking care of the earth very well. What problem are humans causing ?,putting carbon dioxide into the atmosphere,the earth may become too hot,Lets take part in the activities to save the earth! Use the following words or phrases to help you:,prevent from harmful global warming carbon dioxide in turn depend on as a result atmosphere,HomeworkFinish the exercises on page28Write a short passage about how the earth came into being,