Question

The age of most ancient geological formation is estimated by

• A. potassium-argon method
• B. carbon-14 dating method
• C. radium- silicon method
• D. uranium-lead method

Answer 1

Answer: (D)

uranium-lead method

Answer 2

The age of most ancient geological objects is
determined by uranium-lead method. This method
is based on the radioactive properties of uranium.
In this method, we assume that initially the rock did
not contain any lead, we can calculate the age of the
rock by measuring the ratio of concentrations of
$_{92}U^{238}\, and\, _{82}Pb^{206}$