The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis...
Transcript of The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis...
![Page 1: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/1.jpg)
TheEarth’sfirstatmosphere
![Page 2: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/2.jpg)
![Page 3: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/3.jpg)
AstheEarthformed,inadditiontorockysilicatesandmetalliciron,impactingbodiesemplacedvolatilematerialssuchascarbondioxide,hydrogenandhydrogencompounds(methaneandammonia),andnitrogeninthemantle.TheEarth'sfirstatmospherewasformedbyoutgasing;thevolatilegaseswerereleasedfromthemantleviavolcanicactivity
![Page 4: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/4.jpg)
![Page 5: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/5.jpg)
Theearlyatmospherewasprobablyrichincarbondioxide,nitrogen,methane,ammonia,hydrogen,andwatervapor;thisreducingatmospherewasdevoidoffreeoxygen(O2)Theoceanscondensedfromthewatervaporthatoutgasedfromthemantle-thecarbondioxiderichoceanswereveryacidic(carbondioxide+water=carbonicacid)
![Page 6: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/6.jpg)
Thephotodissociationofwatervapormayhaveproducedsomefreeoxygen.Hydrogenescapedintospace;carbondioxidewasusedbyphotosyntheticorganisms;oxygenwasaddedtotheatmospherebyphotosynthesis;nitrogengraduallyincreasedbysteadyoutgasingtoeventuallybecomethemostabundantgasintheatmosphere
Photosynthesisproducedlargequantitiesofoxygenoncelifeevolvedby3.5b.y.;thiseventuallyledtotheoxidizingatmospherewithfreeoxygenthatwehavetoday
![Page 7: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/7.jpg)
Photosynthesisproducedlargequantitiesofoxygenandremovedmuchcarbondioxidefromtheatmosphereoncelifeevolvedby3.5b.y.About3b.y.bandedironformations(BIFs)showthatfreeoxygenwasavailableperiodically,perhapsseasonally,tooxidizeandprecipitatetheabundantironcationsthatweredissolvedinoceanwater(remembertheseironcationsweretheproductofcarbonicacidweatheringsilicaterocks)
![Page 8: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/8.jpg)
About2-1.7b.y.redbeds(hematite-cementedsandstonesandshales)startedtoform,indicatingacontinuoussupplyoffreeoxygen
About2-1.7b.y.carbonaterocks/limestonesandothercarbonaterocksbecamecommonindicatingthatoxygenhadincreasedandcarbondioxidereducedthroughphotosynthesissothatoceanacidityhaddecreasedenoughtoallowcalciumcarbonatetoprecipitate.
![Page 9: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/9.jpg)
BandedIronFormationsaresedimentaryrocksthathavealternatinglayersofiron-richmineralsandafine-grainedsilicarockcalledchert.
![Page 10: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/10.jpg)
![Page 11: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/11.jpg)
Redbeds
![Page 12: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/12.jpg)
Carbonaterocks
![Page 13: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/13.jpg)
![Page 14: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/14.jpg)
![Page 15: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/15.jpg)
![Page 16: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/16.jpg)
![Page 17: The Earth's First Atmosphere · become the most abundant gas in the atmosphere Photosynthesis produced large quantities of oxygen once life evolved by 3.5 b.y.; this eventually led](https://reader033.fdocuments.net/reader033/viewer/2022042015/5e7407f16f31e2472874e50e/html5/thumbnails/17.jpg)
http://www.dailygalaxy.com/my_weblog/2008/06/ion-microprobe.html
IonMicroprobeTechnologyRevealsEarthwasHabitable4.3billionyearsago