Radiometric Dating Methods Determine the Age of Rock Formations How

Question

Radiometric dating methods determine the age of rock formations how?
A)By using guide or index fossils
B)By relating the positions of layers to each other
C)By calculating the ratios of elements and decay products
D)By examining atoms for extent of wear and tear

Accepted Answer

Radiometric dating methods involve calculating the ratios of certain elements, such as uranium and lead, in the rock formation. As these elements decay over time, the ratio of parent to daughter elements changes, allowing scientists to determine the age of the rock formation. Guide or index fossils (A) and relating the positions of layers to each other (B) are methods used in relative dating, which can provide an idea of the order in which formations were created but not the exact age. Examining atoms for wear and tear (D) is not a valid method for determining the age of rock formations.