How Lead Dating Proves Earth Is Billions, Not Thousands of Years Old

What Happened A Reddit user shared confusion about a Facebook post claiming Earth is only 4,000 years old, which was countered by someone citing lead’s existence as disproof. The exchange highlighted uranium-238’s 4.5-billion-year half-life and its decay into lead, but left many wondering how this actually disproves young Earth claims. The scientific argument centers on radiometric dating, specifically uranium-lead dating, which measures the ratio of uranium isotopes to their lead decay products in rocks and minerals.