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In addition, the oldest known moon rocks are 4.5 billion years old.
Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age.
These use radioactive minerals in rocks as geological clocks.
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You can learn more about fossils, dinosaurs, radiometric dating and related topics by reading through the links on the next page.
Radiometric dating isn't the only method of determining the age of rocks.
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