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Nature 442, 128-131 (13 July 2006) | doi:10.1038/442128a; Published online 12 July 2006

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Geology: The start of the world as we know it

Alexandra Witze1

  1. Alexandra Witze is Nature's chief of correspondents for America.

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Plate tectonics has created oceans and pushed up mountain ranges. But when did the process that shapes the planet get going? Alexandra Witze joins the geologists debating the issue.

On a sunny, breezy day in the Wind River Mountains of Wyoming, a group of geologists are peering intently at a dark ridge of rock. Some 2.

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