Select all the correct answers.
Sully works as a geologist in the southwestern United States. He plans to choose an unstable isotope to find the absolute age of a rock sample. Which two aspects must he consider before making his choice?
There should be a sufficient amount of the selected isotope in the rock.
The isotope should be one that decays at a very fast rate.
The isotope must not be found in any neighboring rocks.
The half-life of the isotope must be long enough to capture the age of the rock.
There should be more than one unstable isotope in the rock.
