小组课unit4reading.ppt
ReadingHOW LIFE BEGAN ON THE EARTHthe planets of the solar system How many planets circle around the sun?What are they?海王星海王星 Neptune水星水星Mercury 金星金星Venus 地球地球Earth 火星火星Mars 木星木星Jupiter 土星土星Saturn天王星天王星Uranus Uranus Venus Earth Mars Mercury Jupiter Neptune Saturn On which planet isthere life at present?The earth Pangu separates the sky from the earth.Each religion and culture has its own ideas about how life began on earth.What do you know?Nvwa made humans.Other legends about the beginning of universe.God created the world in 7 days.ReadingHow life began on the earth Life in the water.Life in the water.海洋里的细胞开始分裂海洋里的细胞开始分裂 amphibians两栖动物reptile爬行动物爬行动物dinosaurdinosaurMammals哺乳动物The rise of humankindScanning1.The text is written in _ order.2.Read the passage and try to get the main idea for each paragraph.学案学案 P3，Step3 Ex3 TIMEPara.1 The formation(形成形成)of the earth.Para.2 The importance of water for life.Para.3 A widely accepted theory about the formation of the universe.Para.4 The arrival of humans and their impact on the earth.Para.5 The development of plants and animals on the earth.Group work 学案学案Step 2,Step 3 E2,step 4课本课本 P27 Ex3Group work Task 1学案学案Step 2,step 4Task 2学案学案Step 3 E2,step 4Task 3课本课本P27 Ex3，学案，学案 Step4Video What happened after the“Big Bang”?Big Bang atoms stars other bodies for several billion years after“Big Bang”a cloud of dust between4.5 and 3.8 billion years ago settled into a solid globeexplodedwith fire&rockWhat did the explosion produce?C,N2,water vapor,and other gases formed atmosphere water appeared allowed the earth to dissolve harmful gases and acids Life began on the earthcooled down What was the function of water?The development of life on the earth the age of dinosaurs small plants in watershellfish&other fishgreen plants began to grow on landinsects and amphibianscan live on land and in the waterthe plants grew into forestsreptileslay eggsmammalsgive birth to young baby animalsclever animalsatmospheric CO2 levels since 1940 show a continuing increase,but during this period,global temperature decreased until 1975,and has increased since then.volcanoes produce significantly more CO2 per year than humans.Animals andplants produce 150 gigatons(十亿吨)of CO2 each year.Dying leaves produce even more CO2.The oceans are the biggest source of CO2 by far”.Human activity produces a mere 6.5 gigatons(十亿吨)of CO2 each year.global warming
