How old are you? How old are your grandparents? Do you know how old Canada is? Or the pyramids in Egypt? Do you know how old Earth is?
How do scientists even know how old the Earth is? Or how long ago dinosaurs existed? Scientists have many ways to discover how old rocks and fossils are.
The oldest and most reliable method they use is called Uranium-lead U-Pb dating. Scientists use this method to date rocks that formed from between 1 million to 4.
Scientists can use monazite, titanite, baddeleyite and zirconolite for uranium dating.
The most common mineral used, however, is Zircon. Yes No I need help. Zircon may be nature's best clock.
It is ideal for use in dating, or geochronology, for many reasons.