Question

Which method describes an example of absolute dating?

A.
determining the vertical sequence of rock layers

B.
measuring the radioactive decay of isotopes within rock layers

C.
determining the horizontal sequence of rock layers

D.
identifying index fossil in rock layers

Answer 1

B) generally scientists will measure the decay of carbon 14 which is a radioactive isotope of carbon with a specific half life (I think 5437 years but I could be way off don't hold me to that number) and that way scientists can tell how old a fossil is
Hope this helped