Unit5AdelicateworldStartingout&understandingideas1.ArehumanspartofEarth'secosystems?Why?2.Inwhatwayscanhumansaffectecosystems?Watchthevideoandanswerthequestions.Humanscanaffectecosystemsinpositiveandnegativeways.ADelicateWorldStartingOutWhatisanecosystem?Anecosystemisageographicareawhereplants,animals,andotherorganisms,aswellasweatherandlandscape,worktogethertoformabubbleoflife.Ecosystemscontainbioticorliving,parts,aswellasabioticfactors,ornonlivingparts.Bioticfactorsincludeplants,animals,andotherorganisms.Abiotic([?e?ba?'?t?k]adj.非生物的；與生物無(wú)關(guān)的)factorsincluderocks,temperature,andhumidity.Everyfactorinanecosystemdependsoneveryotherfactor,eitherdirectlyorindirectly.Achangeinthetemperatureofanecosystemwilloftenaffectwhatplantswillgrowthere,forinstance.Animalsthatdependonplantsforfoodandshelterwillhavetoadapttothechanges,movetoanotherecosystem,orperish.Activity1Watchthevideoandanswerthequestion1.ArehumanspartofEarth’secosystems?Why?Yes.HumansarepartofEarth'secosystems.Becausealllivingthingsliveinecosystemsandpeoplearelivingthings.Inwhatwayscanhumansaffectecosystems?Activity2Watchthevideoagain,thendiscusswithyourgroupsandanswerthequestion2.Positive:peoplecanplanttrees,feedandprotectanimals,recyclethingsandsoon.Negative:Theairandwaterpollutionandexcessivewaste.Activity3LookatthesatelliteimagesandaddsomeinformationofAralSea.Whatishappeningtotheareaaccordingtothesatelliteimages?LocatedinCentralAsia,betweenKazakhstamtothenorthandUzbekistantothesouthThefourthlargestlake(1960s)Justfoursmallerlakes(NOW)Activity4WatchthechangeofAralSea,answerthequestions.Activity4DiscusswithyourgroupsWhatdoyouthinkalatersatelliteimagewouldshow?Why?Activity4Discusswithyourgroupsandanswerthequestion.(5min)Whatdoyouthinkcausedthesechanges?TheirrigationprojectClimatechangeVegetationDamage...Activity5Lookatthediagramandanswerthequestions.Payattentiontotheexpressionsinbold.grasssheepwolffungiProducersabsorbwateranddissolvednutrientsfromthesoil.Theyalsomaketheirownfoodbyabsorbinglightfromthesun.Primaryconsumersrelyonvegetationtoprovideenergy.Theyfeedongreenplants.Secondaryconsumerspreyonprimaryconsumers,aswellaseatingotheranimalmatter.bacteriaDecomposersbreakdowndeadanimalandvegetablematterintonutrients.Thedissolvedchemicalsarethereleasedbackintothefoodchain,tobeusedbyproducers.1.Whatdoesthediagramshow?2.Whataretherelationshipsbetweenthelivingthings?Thediagramshowsafoodchain–theconnectionbetweenthelivingthings.2Thelivingthingsarecloselyconnectedwitheachotherbythefoodtheyeat.Secondaryconsumerspreyonprimaryconsumers,primaryconsumersfeedonproducers,andproducersabsorblightfromthesun,andwateranddissolvednutrientsfromthesoil,whichareprovidedbydecomposers.Task2Complete

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passagewiththecorrectformoftheexpressionsinTask1.1.absorb2.relyon3.fedon4.preyon5.breakdown6.releaseWhatishappeninginthepictures?Whatmayitcause?soilerosionanddegradationDeforestationaffectshabitats,biodiversity,airquality,waterways,andnearlyeveryotherpartofthenaturalworld.濫砍濫伐thelossofhabitatforanimalspeciesglobalwarmingNegativeeffectsPhotostakenatthesamelocationonOuli

MountaininZhangwucounty,Liaoningprovince,in2018and2022showastrikingtransformationfrombarrenlandtoagreenoasis.Positiveeffectschaos=mess,disorderconservation=protectionWhychaosHowconservationA.ToanalysehowMacquarieIslandwassavedfromdestruction.B.ToinformreadersofthechaoscausedonMacquarieIslandbyhumans.C.Toente