moon rocks

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How old is the earth, and how do we know?

How old is the earth? Short answer: 4,540,000,00/H30 Earth-years, plus or minus 1%. Long answer: We don’t know exactly because direct dating of the earliest material on the surface of the Earth will only tell use a minimum age; Prior to that, the Earth’s surface was probably molten, and even after that, it may be…