The Origins of Oxygen on Earth

The oxygen molecule was a surprisingly late addition to Earth's history. Oxygen gas is simply too reactive to exist very long in a free state. If the relative percentage of Uranium 235 was higher on Earth in the past, why aren't there oclos all over the place? The answer involves oxygen. Download the Baker's app now to save big. Save big on your favorites with the Buy 5 or more Save a Dollar each sale.