Science, Maths & Technology
Rock Clocks
...out quite a precise age for a rock containing traces of uranium, by looking at the uranium-lead ratio in the crystals. Once we know the amount of daughter element (lead) and since we know the rate of decay, we can work back to the time when there was no daughter, but only the parent, and this give us the age of the rock. This process is called ‘radiometric dating’....