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      <title>carbone 3h by Gruppo 1</title>
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      <pubDate>2015-05-15 08:26:27 UTC</pubDate>
      <lastBuildDate>2015-06-09 06:47:50 UTC</lastBuildDate>
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      <item>
         <title>che cosa è il carbone</title>
         <author>cc111</author>
         <link>https://padlet.com/cc111/b8tr89j4dk3q/wish/60604701</link>
         <description><![CDATA[<p><h1><br></h1><p>Il carbone è un combustibile fossile così come il petrolio e il gas 
naturale. A differenza di questi ultimi, il carbone è un combustibile 
solido, e, tra i combustibili solidi, è il più utilizzato al mondo nella
 produzione di energia elettrica. Il carbone, il petrolio e il gas 
naturale hanno una diversa origine oltre che un aspetto differente. 
Infatti, mentre il petrolio e il gas naturale si sono formati dai resti 
di microscopici organismi acquatici (plancton, molluschi, coralli, 
ecc.), sedimentati sul fondo di antichi mari, il carbone è costituito 
dai <b>resti di piante del passato </b>le cui strutture e forme, sebbene
 modificate, sono ancora riconoscibili al microscopio. Il carbonio 
rimane il principale componente del carbone dopo che gli altri 
componenti fondamentali della materia vivente originaria (idrogeno, 
ossigeno e azoto) sono progressivamente venuti meno durante i processi 
chimico-fisici che l’hanno trasformata. La combustione del carbone 
libera, dunque, l’energia del Sole immagazzinata dalle piante con la 
fotosintesi milioni di anni fa: per questo, è un prezioso contenitore di
 energia solare “fossile”.</p></p>]]></description>
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         <pubDate>2015-05-15 08:28:32 UTC</pubDate>
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         <pubDate>2015-05-15 08:46:11 UTC</pubDate>
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         <pubDate>2015-05-19 06:41:13 UTC</pubDate>
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         <pubDate>2015-05-19 06:52:18 UTC</pubDate>
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         <pubDate>2015-05-19 06:53:30 UTC</pubDate>
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         <pubDate>2015-05-19 06:56:43 UTC</pubDate>
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         <pubDate>2015-05-19 06:57:12 UTC</pubDate>
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         <pubDate>2015-05-22 08:20:42 UTC</pubDate>
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         <pubDate>2015-05-22 08:24:35 UTC</pubDate>
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         <pubDate>2015-05-22 08:27:22 UTC</pubDate>
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         <pubDate>2015-05-22 08:33:47 UTC</pubDate>
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         <title></title>
         <author>cc111</author>
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         <description><![CDATA[]]></description>
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         <pubDate>2015-05-26 06:48:39 UTC</pubDate>
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         <title></title>
         <author>cc111</author>
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         <pubDate>2015-05-26 06:52:32 UTC</pubDate>
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