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The oldest rocks of terrestrial origin are between 4.2-4.3 billion years old, and the oldest rocks of extraterrestrial origin are around 4.5-4.6 billion years old. The rocks of the oceanic crust are less than 200 million years old, some being as fresh as a new baby. Continental rock, on average is much older than oceanic rock, as it is not subducted in the process of plate tectonics.

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