PASADENA, California, March 3 -- The California Institute of Technology posted the following news:

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Ancient Zircon Crystals Provide a Window into Early Earth History

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There are many open questions about how our planet formed 4.55 billion years ago: When did plate tectonics start? When did the earth's mantle begin to vigorously circulate in a process called convection? What was Earth like early in its lifetime? Because no rock records . . .

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