Answer:
Because we are not actually exactly certian when the Earth actually began. For all we know, it could have been millions or trillions of years before the Caveman and Dinosaurs were even alive.
Step-by-step explanation:
It has been difficult for scientists to determine the age of the Earth because there is no direct evidence. All the old rocks that could have proved how old Earth is were destroyed and recycled into new rocks from natural causes.
6.2m questions
8.2m answers