Unit5AdelicateworldStartingoutUnderstandingideas课件-高中英语选择性.pptx

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Unit5AdelicateworldStartingoutUnderstandingideas课件-高中英语选择性.pptx

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ByMr.AbleBook5Unit5AdelicateworldStartingout

ToanalysethereasonswhythechangesofAralSea’ssatelliteimageshappened;Todiscusstheactionswecantaketoprotectourearth;TolearnhowthechaoswascausedinMacquarieIslandandhowpeopletriedtoprotecttheisland;Tolearntodescribeastorybyusingamind-map;Torealizethegreateffectofhumans’actionsonecologyandtheimportanceofecologicalbalance.Learningobjectives

Whatishappeninginthepictures?extensivedeforestation1.serioussoilerosion;2.desertification;3.shorageoffreshwater;4.Severedrought......Activity1Lead-inspeakingSeveredamagetotheecosystem

Whatisanecosystem?Anecosystemisageographicareawhereplants,animals,andotherorganisms,aswellasweatherandlandscape,worktogethertoformabubbleoflife.Ecosystemscontainbioticorliving,parts,aswellasabiotic([?e?ba??t?k]非生物的)factors,ornon-livingparts.Bioticfactorsincludeplants,animals,andotherorganisms.Abioticfactorsincluderocks,temperature,andhumidity.Everyfactorinanecosystemdependsoneveryotherfactor,eitherdirectlyorindirectly.Achangeinthetemperatureofanecosystemwilloftenaffectwhatplantswillgrowthere,forinstance.Animalsthatdependonplantsforfoodandshelterwillhavetoadapttothechanges,movetoanotherecosystem,orperish.Activity1Lead-inspeaking

Awonderfulserenityhastakenpossesstundra/t?ndr?/冻原temperategrassland温带草原llano[lɑ?n??]南美大草原Awonderfulserenityhastakenpossesstaiga/ta?ɡ?/北方针叶林prairie/?pre?ri/北美草原intertidalzone/?nt?ta?d?l/潮间带Awonderfulserenityhastakenpossesssavannah/s?v?n?/稀树草原steppe/step/干草原subtidalzone/s?bta?dl/潮下带Whatecosystemsdoyouknow?Activity1Lead-inspeaking

Awonderfulserenityhastakenpossesscontinentalshelf大陆架tropicalrainforests热带雨林wetlands湿地Awonderfulserenityhastakenpossessdeepoceanzones深海带Articicepacks北极浮冰Awonderfulserenityhastakenp