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Early Earth
DECEMBER 2006
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Yellowstone: Rock of Ages
Photograph by Frans Lanting
Our planet began as an elemental place of rock and gases, where the sun was fainter than now and the moon—orbiting at less than a tenth of its current distance—looked immense. Hundreds of millions of years passed before the planet was fit for life. But here and there, scenes on today's very different Earth evoke its harsh beginnings.
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