“Unfortunately, we haven't found many very old rocks on Earth because our planet's surface is constantly renewed by plate tectonics, coupled with erosion.”
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Unfortunately, we haven't found many very old rocks on Earth because our planet's surface is constantly renewed by plate tectonics, coupled with erosion.
Robert Duncan 
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The formation of glass from the melting is like starting a clock. It resets the time for us to determine billions of years later.
Robert Duncan
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