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1、Learning objects:1.Learn something about the development of the earth.2.Learn something about the origin of life on the earth.3.Understand that the earth is our only home and try our best to take care of her.第1页/共32页What do you know about astronomy?Sun is a star（恒星）,which can give off light and heat
2、 by itself,and is also the center of the solar system.Sun is the basic source of energy.第2页/共32页In our solar system eight planets circle around the sun.第3页/共32页MercuryVenusEarthMarsJupiterSaturnUranusNeptune第4页/共32页Pre-reading1.Nearly everybody has this or that puzzle:How do human beings come into b
3、eing?How does the Earth come into being?2.In China,there are two legends about these puzzles.Do you know their names?第5页/共32页Pangu separated the sky from the earth.第6页/共32页The Goddess Nvwa mended the heaven and created human beings from the clay(粘土).第7页/共32页4.In Western culture,who creates the world
4、?God created the world in seven days.第8页/共32页Fast-reading1.Whats the title of the text?2.From the title,we can predict that the text may tell us_on the earth.the origin of life第9页/共32页Skim the text quickly and match the main idea with each paragraph.Para 1:A.The importance of water for lifePara 2:B.
5、The development of plants and animals on the earth Para 3:C.The formation of the earthPara 4:D.A widely accepted theory about how the universe beganPara 5:E.The arrival of humans and their impact on the earth 第10页/共32页The universe began with a“Big Bang”that threw matters into all directions.After th
6、at,atoms began to form and combine to create stars.Big Bang Theory Big Bangthe universethe solar system the sunthe earthA widely accepted theory about how the universe began:第11页/共32页Detailed readingThis text can be divided into two parts.Part 1:The development of the earth(Paras.1-3)Part 2:The deve
7、lopment of life(Paras.4-5)第12页/共32页Read Part 1(Paras.1-3)and answer:Q1:What made up the earths atmosphere after the earth exploded?Q2:How did the earth come into being?Q3:How did water come into being on the earth?Part 1:The development of the earth第13页/共32页Q1:What made up the earths atmosphere afte
8、r the earth exploded?After the earth exploded,the earths atmosphere was made up by_,_,_ and _.carbon dioxidenitrogenwater vapourother gases第14页/共32页1.The earth became a solid globe.2.Water appeared on the earth.3.The earth was a cloud of dust.4.The universe began with a“Big Bang”.5.Carbon dioxide,ni
9、trogen,water vapour and other gases were produced.6.The earth exploded loudly with fire and rock.351462Put the order of development of the earth into a time line.Q2:How did the earth come into being?第15页/共32页Q3:How did water come into being on the earth?The earth_produced _The earth _ appearedexplod
10、edwater vapourcooled downWater第16页/共32页A cloud of dustsettled into _with fire&rock(produced _)atmospherecooled down_ appeared _ harmful gases into seas Life beganLife developeda solid globeexploded CO2，N2，H2O and other gaseswaterdissolvedReview:the development of the earth第17页/共32页Part 2:The develop
11、ment of life第18页/共32页12345678910small plants in watershellfish and all sorts of fish insectsreptilesamphibiansmammalsdinosaurs humansplantsanimalsgreen plants on landforestsRead Part 2 and find out the order of the development of life on the earth.第19页/共32页 small plants appears in water第20页/共32页shel
12、lfish and all sorts of fish第21页/共32页green plants began to grow on land insects appeared第22页/共32页amphibians on land and in the waterforests第23页/共32页 reptiles appeared dinosaur developed第24页/共32页mammals on land第25页/共32页 small clever animals第26页/共32页1.Who are the small clever animals with hands and fee
13、t?2.Are they taking care of the earth well?Why?Post-reading第27页/共32页What problems have been caused by humans to the earth?In pairs,discuss these questions:problemspollutionglobal warmingabnormal weatherwildlife extinctionresourses shortagedesertification.第28页/共32页 We are putting too much carbon diox
14、ide into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot to live on.global warmingThe earth is becoming hotter and hotter!第29页/共32页What can we do to take care of the earth?plant treesreduce rubbishsave watersave paperuse recyclable thingssave electricityRide bikes or take a bus or walk to school.Arouse peoples awareness of protecting the environment.第30页/共32页Homework:Exx.1-4,WB 63.第31页/共32页感谢您的观看！第32页/共32页