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      <title>How do scientists know when water appeared?  by </title>
      <link>https://padlet.com/erleese64/cxi04xvohvl7</link>
      <description>Water is so important to the survival of life on Earth, but when and HOW did it get here? </description>
      <language>en-us</language>
      <pubDate>2018-07-13 02:37:53 UTC</pubDate>
      <lastBuildDate>2025-11-29 15:06:44 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
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         <title>Early Earth </title>
         <author>erleese64</author>
         <link>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108181</link>
         <description><![CDATA[<div>We know that an Early Earth was very hot and violent which means that surface water would have evaporated. That means that water arrived after the planet was created.</div>]]></description>
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         <pubDate>2018-07-13 02:43:08 UTC</pubDate>
         <guid>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108181</guid>
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      <item>
         <title>Asteroids </title>
         <author>erleese64</author>
         <link>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108333</link>
         <description><![CDATA[<div>Scientists seem to think that due to the high concentration of water molecules in asteroids that one collided with Earth and helped create oceans </div>]]></description>
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         <pubDate>2018-07-13 02:45:48 UTC</pubDate>
         <guid>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108333</guid>
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      <item>
         <title>How do they know how old it is? </title>
         <author>erleese64</author>
         <link>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108515</link>
         <description><![CDATA[<div>Scientists look at the ratio of hydrogen to heavy hydrogen (deuterium) because the ice found in space has a higher ratio of deuterium than hydrogen and they used a computer model to turn time back to before the solar system was created. About 30-50% of our water is older than the SUN!</div>]]></description>
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         <pubDate>2018-07-13 02:48:56 UTC</pubDate>
         <guid>https://padlet.com/erleese64/cxi04xvohvl7/wish/270108515</guid>
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      <item>
         <title>Sources</title>
         <author>erleese64</author>
         <link>https://padlet.com/erleese64/cxi04xvohvl7/wish/270109446</link>
         <description><![CDATA[<div><a href="https://www.smithsonianmag.com/science-nature/how-did-water-come-to-earth-72037248/">https://www.smithsonianmag.com/science-nature/how-did-water-come-to-earth-72037248/</a><br><a href="http://science.sciencemag.org/content/345/6204/1590">http://science.sciencemag.org/content/345/6204/1590</a><br><a href="https://www.offset.com/search/early+earth">https://www.offset.com/search/early+earth</a></div>]]></description>
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         <pubDate>2018-07-13 02:59:38 UTC</pubDate>
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