Question

the ______ age of a rock is the number of years since the rock formed.
a relative
b absolute
c temporary
d apparent

Explanation:

In geology, the number of years since a rock formed is defined as its absolute age. Relative age refers to the age of a rock compared to others, temporary means short-lived, and apparent means seeming but not actual—none match the definition of years since formation.

Answer:

b. absolute