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WASHINGTON _ Piece by piece, scientists are putting together the clearest story ever assembled of the infancy of our planet.
Some early chapters of Earth's biography are still incomplete.
But thanks to their latest discoveries, researchers now think they know the most likely answers to these momentous questions:
_When and how were the Earth and its moon born?
_When did the first continents and oceans appear?
_Most important of all, when did life on Earth begin? (How it began remains an unsolved mystery.)
Most scientists believe that these crucial events at the dawn of the world occurred more than 4 billion years ago.
Source: HighBeam Research, Scientists piecing story and details of Earth's beginning.(Knight...