Choose one of the objects in the list below. Which radioactive isotope or isotopes would you use to date the object you chose? Explain why the radioactive isotope or isotopes is best for the object you chose. A 4-billion-year-old piece of granite.
A 1-million-year-old bed of volcanic ash that contains the footprints of human ancestors.
The fur of a woolly mammoth that was recently recovered, frozen in a glacier.
A fossilized trilobite from a bed of sandstone that is about 500 million years old.