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人教版英语选修六Book6Unit5reading市公开课一等奖省赛课获奖PPT课件.pptx

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ThePowerofNatureDoyoustillrememberwhathappenedonMay26,?Doyouknowanyothernaturaldisasters?Guesswhattheyareaccordingtothepictures.tsunamityphoontornadovolcanoHoweverweakweare,wearenotcompletelypowerless.Peoplearetryingmanywaystolearnaboutnaturaldisastersallthetimetoprotectthemselves.VolcanoesbegintoformwhentherocksofthelowerplategetpusheddeepintotheEarth.Theretheyareheated,untiltheymelt,formingmagma,onekindofliquidrock,becausemagmaislessdensethanthesolidrockaroundit,itispushedupward.IfthemagmafindsaweakplaceattheEarth’ssurface,itmaybreakthroughandformavolcano.Canyouimagineclimbingintoalivevolcanoinordertotakethetemperatureoftheboilingrockinside?Whowillclimbintoalivevolcanototakethetemperatureoftheboilingrockinside?Doyouwanttobeavolcanologist?AnExcitingJobInwhatwaydidthewriterfindthejobexciting?GetthemainideaofeachparagraphWhyisavolcanologist’sjobimportant?Whatmadetheauthorrealizethataneruptionoccurred?Whatdoesthewriterfindimpressiveevenafterstudyingvolcanoesformorethantwentyyears?Whatmakeitdifficultforthewritertowalktowardstheedgeofthecrater(threewords)?OnMay12,,astrongearthquakehitWenchuan.Theearthquaketookplaceat14:48BeijingTimeandtremorswerefeltasfarasWuhan,ShanghaiandBeijing.OfficialfiguresstatedthatbyJune23,,69181hadbeenconfirmeddead,including68,636inSichuanprovince,and374,176injured,withanother18,498missing.Theearthquakeleftabout4.8millionpeoplehomeless.So,howdoearthquakeshappen?Theearthismadeupofseverallayers.Thetoplayeroftheearthiscalledtheearth’scrust.Thecrustisdividedintosectionswhicharecalledplates.Whentwoplatespushagainsteachother.orwhentwoplatesrubagainsteachother.anearthquakehappens.Anearthquakecausesthegroundabovetheplatetoshake．TheenergysourceoftheWenchuanearthquakementionedabovecamefromthestrikeoftheIndianPlateontotheEurasianPlateanditsnorthwardpush.Earthquakesaremostlikelytohappenattheboundariesoftheearth’splates．Eachoftheseplatesisabout70kilometresthick．