Originally Posted by antlers
Originally Posted by Dixie_Dude
If the earth were billions of years old, then nuclear decay would have made all uranium turn into lead by now.
This is simply not true. Over 99% of the naturally occurring uranium in the world is U-238, and its half-life is 4.5 billion years. That means that we have half as much U-238 in the world now as we did 4.5 billion years ago when the earth was formed. It also means that in another 4.5 billion years, we will still have half as much U-238 in the world then as we do now. And in another 9 billion years, we will still have half as much U-238 in the world then as we will have in another 4.5 billion years from now.


Yep. Yet that old chestnut is dragged out time after time regardless of explanation.