I mean, the existence of lead doesn't necessarily prove the age of the earth so much as that those elements have existed for that long.

HOWEVER -- you're basically guaranteed to find lead in uranium deposits found around the earth, and the ratio of lead/uranium is how we calculated the 4.6 billion years.

Uranium is formed in Neutron stars or Supernova, so at the very least - the uranium found on earth itself is 4.6 billion years old. Whether "Earth" was "Earth" back then, who knows. This could be pre-moon? Could be before the earth even cooled down to have a solid outer layer? So the estimate is bound to be off by a little...

Just not by 4.5 billion years.

I'm pretty sure just soap has been around for more than 4.5k years and that means civilization too. So even if you do some backflips in justification here, there's no way you get 4k.

But the half life of polonium 210 is just 138 days. other is a few days. radium 226 is 1602 years. Why couldn't the earth have started with a lot of radium 226? Checkmate round earthers.

"God made the world with lead in it"

The correct answer would have been: "Why should I? You're an idiot."

This proof is partial though. This assumes there is only 1 way of obtaining lead. What if lead appeared from fusion in stars younger than that.

WERE YOU THERE TO SEE IT???? - The next moronic rebuttal

I had a dude come up to me at the reference desk and tell me that the earth can’t be billions (he said trillions, lol) of years old because erosion from the Mississippi River would make it wider and deeper than it is. I pulled up some info including the idea that the Mississippi was something that came about more recently because of plate shifting, etc and he just said, "Nah."