Earth's age is best estimated by: a. chronologies developed using biblical sources b. best guess c. using fossils d. using radioactive isotope pairs to date the oldest rocks.

Earth's age is best estimated by:

Out of all the options presented above the one that represents the best way to estimate the Earth’s age is answer choice D) using radioactive isotope pairs to date the oldest rocks. This method is best known as radiometric dating.

I hope it helps, Regards.