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New Evidence May Show Where Earth's Water Came From

VOA News

   A study published this week offers evidence regarding how water
   originated on Earth, and the clues come from some of the oldest rocks
   in the solar system.

   Earth's abundance of water makes it unique in the solar system, but
   scientists have never been sure how it got here. Some believed the
   water -- or chemical compounds that make up water -- was here all
   along, embedded in the original rock that formed the Earth about 4.5
   billion years ago.

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