Question

Which radioactive isotope would you use to date a 2-million-year-old bed of volcanic ash that contains the footprints of human ancestor

1. Carbon - 14 dating
2. Uranium 238 - lead -206 dating
3. Potassium - argon dating

Answer 1

3. Potassium - argon dating

Step-by-step explanation:

The potassium-argon dating method has been used to measure a wide variety of ages. The potassium-argon age of some meteorites is as old as 4,500,000,000 years, and volcanic rocks as young as 20,000 years old have been measured by this method.