1.3 billion and 750 million years ago,
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, all the continents amassed in a great land known as Rodinia. Go back even further,
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, about 1.4 billion years or more,
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, and the crustal shards had arranged themselves into a supercontinent called Nuna.
Using powerful computer programs and geologic clues from rocks around the world,
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, researchers are painting a picture of these long-lost worlds. New studies of magnetic minerals in rock from Brazil, for instance, are helping pin the ancient Amazon to a spot it once occupied in Nuna. Other recent research reveals the geologic stresses that finally pulled Rodinia apart,
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, some 750 million years ago. Scientists have even predicted the formation of the next supercontinent — an amalgam of North America and Asia,
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, evocatively named Amasia — some 250 million years from now.








WAITING FOR AMASIA,
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? This simulation depicts how the future supercontinent Amasia could form over the North Pole. R,
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. Mitchell/YouTube




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