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      <title>Ch1: L&#39;atmosphère primitive et son évolution by Gilles Calatayud</title>
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      <pubDate>2016-01-20 14:20:09 UTC</pubDate>
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         <title>Evolution de l&#39;O2 atmosphérique et indices géologiques</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/493995245</link>
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         <pubDate>2020-04-06 05:12:06 UTC</pubDate>
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      <item>
         <title>Aux origines de la vie</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494005630</link>
         <description><![CDATA[<div>Mais comment la vie a -t-elle pu apparaître</div>]]></description>
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         <pubDate>2020-04-06 05:26:54 UTC</pubDate>
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         <title>Histoire de la vie</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494013376</link>
         <description><![CDATA[<div>Les  étapes de l'évolution terrestre</div>]]></description>
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         <pubDate>2020-04-06 05:38:17 UTC</pubDate>
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         <title>L&#39;uraninite (UO2) = avant 2,2 Ga: forme cristallisée</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494052978</link>
         <description><![CDATA[<div>Transformation possible de l'Uraninite en présence d'O2: <br>UO2 (U<sup>4+</sup>) + O2 --&gt; UO3  (U<sup>6+</sup>)(soluble)</div>]]></description>
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         <pubDate>2020-04-06 06:24:49 UTC</pubDate>
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      <item>
         <title>La Pechblende</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494666410</link>
         <description><![CDATA[<div>Uraninite massive </div>]]></description>
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         <pubDate>2020-04-06 12:39:40 UTC</pubDate>
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      <item>
         <title>L&#39;Autunite</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494674776</link>
         <description><![CDATA[<div>contient de l'uranium associé à du phosphore et du calcium: se forme après 2,2 Ga </div>]]></description>
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         <pubDate>2020-04-06 12:43:56 UTC</pubDate>
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      <item>
         <title></title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494707211</link>
         <description><![CDATA[]]></description>
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         <pubDate>2020-04-06 13:00:32 UTC</pubDate>
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      <item>
         <title>Le fer rubané: redbeds vers 2,2 Ga</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494727052</link>
         <description><![CDATA[<div>Niveau rouge alternant avec de la silice (grise) = utilisation du fer disponible = formation de Fe<sub>2</sub>O<sub>3</sub></div>]]></description>
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         <pubDate>2020-04-06 13:09:39 UTC</pubDate>
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         <title>Les stromatolites &quot;des pierres vivantes&quot; </title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494843760</link>
         <description><![CDATA[]]></description>
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         <pubDate>2020-04-06 13:56:21 UTC</pubDate>
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         <title>Stromatolithes (ou stromatolites) vues en coupe</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494856992</link>
         <description><![CDATA[<div>les plus anciennes: 3,5 Ga</div>]]></description>
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         <pubDate>2020-04-06 14:01:28 UTC</pubDate>
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         <title>Evolution de la composition de l&#39;atmosphère au cours des temps géologiques</title>
         <author>calatayud</author>
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         <pubDate>2020-04-06 14:06:43 UTC</pubDate>
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         <title>Des stromatolites actuelles en Australie</title>
         <author>calatayud</author>
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         <pubDate>2020-04-06 14:11:00 UTC</pubDate>
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         <title>Des hypothèses et des questions</title>
         <author>calatayud</author>
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         <pubDate>2020-04-06 14:13:53 UTC</pubDate>
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      <item>
         <title>Une étape décisive dans l&#39;évolution de l&#39;atmosphère</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494892632</link>
         <description><![CDATA[]]></description>
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         <pubDate>2020-04-06 14:14:49 UTC</pubDate>
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         <title>Des indices géologiques pour retracer l&#39;histoire de l&#39;atmosphère et de la vie</title>
         <author>calatayud</author>
         <link>https://padlet.com/calatayud/cptuzqy33e63/wish/494896170</link>
         <description><![CDATA[]]></description>
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         <pubDate>2020-04-06 14:16:08 UTC</pubDate>
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