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The way it really is: little-known facts about radiometric dating

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There are lots of ways to guesstimate ages, and geologists knew the earth was old a long time ago and I might add that they were mostly Christian creationist geologists. But they didn’t know how old. Radiometric dating actually allows the measurement of absolute ages, and so it is deadly to the argument that the earth cannot be more than 10, years old.

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For example, back in , Lord Kelvin calculated how long Earth might have taken to cool from its original molten state. He concluded that Earth was born 20 to million years ago. Their message proved difficult to decipher. How old is Earth? However, from working with layer upon layer of rock laid down on Earth over long time spans, early 20th century scientists came to believe Earth not millions of years old — but billions of years old.

Modern radiometric dating methods came into prominence in the late s and s. These methods focus on the decay of atoms of one chemical element into another. They led to the discovery that certain very heavy elements could decay into lighter elements — such as uranium decaying into lead.