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How many years ago did the earth cool enough for solid rocks to form ?

How many years ago did the earth cool enough for solid rocks to form ?
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How many years ago did the earth cool enough for solid rocks to form ?

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User Gogol
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As soon as the crust became cool enough not to remelt, convection driven plate ... as early as 4.2 billion years ago, only 400 million years after the Earth formed.
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User Quinette
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