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Scienceray > Authors > shaane
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shaane |
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 | | The Earth | | by shaane, Apr 13, 2008 | | The Earth, which evolved some 4.6 billion years ago. Numerically, that is 4,600,000,000! Humans first appeared around 20,000 BC. At that time, pollution was non existent or at least at an insignificant level amongst man. | | Comments(0) Liked It: 0 |
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