hat were listed as human activities related to greenhouse gas production? What does this do to the rate at which carbon is returned to the atmosphere?

MassextinctionsareperiodsinEarthshistorywhenabnormallylargenumbersofspeciesdieoutsimultaneouslyorwithinalimitedtimeframe.The CretaceousTertiary(orKT)extinctioneventisprobablythemostwellknowntomanypeoplebecauseitwipedoutthedinosaurs,butmanyothermass extinctioneventshaveoccurredthroughoutthehistoryoftheEarth.SomeofthesemassextinctioneventsareevenmoredevastatingthanKT.Themost severeoccurredattheendofthePermianperiodwhenapproximately96%ofallspeciesdisappeared.Manysmallerscalemassextinctionsofplantsand animalshaveoccurredasrecordedinthefossilrecords.CasePartI:GeologicHistoryofEarthThefirstpartofthisassignmentrequiresthatyouconsiderthe historyofextinctiononourplanet.FromtheMuseumofPaleontology(linkbelow)answerthefollowingquestions.Usefullsentencesinparagraphform: 1.Whenyouclickedonthebookmarks,whicheventswerelistedandinwhatorder(thereweresix)?2.IntheGeologicTimeScalesection,imagesofwhich organismsareincludedintheArchaeantimeperiod?3.WhichthreeperiodsoftimearedescribedasEras?Listtherepresentativeorganismsincludedinthe photosthatappearwhenyouclickoneachEra.4.FromtheSamNobleMuseumMassExtinctionsHowmanymajormassextinctionperiodsarelistedhere? Followthelinksfromthatpagetolearnmoreabouteachperiod.Whatcausedeach,andwhichmajorgroupsofspeciesdisappearedfromeachperiod? 5.Choosetwooftherecentextinctionslistedonthislinkandexplainhowtheyoccurred.CasePartII:GlobalClimateChangeScientistshaveconcernsthat humanactivitiesarechangingourenvironmentatrapidratesthatcouldresultinasixthmassextinction.Letsexaminetheevidence:Reviewthistutorialon thecarboncycleandgreenhousegases.6.Whatwerelistedashumanactivitiesrelatedtogreenhousegasproduction?Whatdoesthisdototherateatwhich carbonisreturnedtotheatmosphere?7.Opponentsofthetheoryofglobalclimatechangeproposethatextinctionsareanormalpartofourplanetshistory andthatthetemperatureoftheplanethasalsohistoricallyfluctuated.UsethefollowingGreenhouseGassimulation.BeginbyclickingontheSimulation Controlsintheupperlefthandcorner.Setthegreenhousegasleveltothehighest,checktheboxesviewlabelsandviewapossibleconsequence.Use thearrowinthelowerrighthandcornertowatchtheinteractivegraph,thenselectrunonthesimulationcontrolwindow.8.WhenyouclickontheGraph menu,whatistherelationshipbetweenpercent(%)ofgreenhousegasesandtemperature?Whatistherelationshipbetweentemperatureandice?Which massextinctionfromtheNaturalHistoryMuseumwebsiteinPartIdoesthisremindyouof?9.Whatroledoeshumanactivityplayinthecurrentglobal warmingtrend?PartIII:DrawingConclusionsNowprovideaConclusionparagraphthatexplainswhatconclusionsyoucanmakeforyourselfbasedonthe evidenceprovidedandwhatyounowknowaboutthegeologictimescaleofthehistoryoftheEarth.Whatquestionsarestillleftunansweredforyou? References:UniversityofCalifornia,Berkeley,MuseumofPaleontology.GeologicTime.AccessedonAugust8,2014at http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/gtpage1.html.MassExtinctionsMassExtinctions.SamNobleMuseums.Accessedon August15,2016athttp://samnoblemuseum.ou.edu/understandingextinction/massextinctions/RecentExtinctions11extinctanimalswevelostinour lifetime.PopularMechanics.March2015.AccessedAugust20,2015,athttp://www.popularmechanics.com/science/animals/g201/recentlyextinctanimalslist470209/ CarbonCycleandGreenhouseGasesPearsonLearningSolutions:TheCarbonCycleandGlobalWarming.PearsonHigherEducation,2014. AccessedonAugust8,2014,athttp://www.pearsoncustom.com/mctcomprehensive/asset.php?isbn=1269879944&id=7729GreenhouseGasSimulation PearsonLearningSolutions:TheGreenhouseEffect.PearsonHigherEducation,2014.AccessedonAugust8,2014,athttp://www.pearsoncustom.com/mctcomprehensive/asset.php?isbn=12698799

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