One of the common methods of finding the age of rocks, and ultimately the age of the Earth, measures the decay of radioactive uranium into lead – the more lead, the older the rock. The method, however, makes some very big assumptions. First, scientists assume there was no lead in the rock when it first formed, but this is unprovable. Then, they assume that rocks are like locked vaults and that no uranium, lead, or the in between decay elements can ever enter or leave the rock.
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