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16 October, 08:11

How does radioactivity make it possible to understand how earth can be so old and still have a hot interior?

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  1. 16 October, 08:35
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    I know that we can find how old the Earth is by knowing how much uranium ultimately decayed into lead. Uranium-238 has a very long to decay, about 4.5 billion years. So that is how we are able to understand how old the Earth is.
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