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From Discover | Environment:
Ancient diamonds suggest a thick skin on the early Earth. Geologists don't agree on whether the infant Earth's surface was hot and molten or stable and cool—or even when the first solid crust formed. What they do agree on generally is that the crust grew as material from Earth's mantle, the middle layer of our planet, melted and rose to the surface, where it hardened. Now the discovery of tiny diamonds in a Western Australian site provides a new timeline for when this process began.
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