The answer in finding the age of a sedimentary rock layer through radiometric dating can be assumed <span>between the absolute ages of the two igneous units.
Sedimentary rocks don't have radioactive elements so the beast way to know the age is through understanding what can elements in between can provide as evidence</span>
Proximity means close to you. For example A few yards. Its proximity to the sun in its passage near that body.
The Answer is second option (Tombouctou).
