Question

How was the geologic time scale developed?

A. By radiometrically dating successive intervals in rock layers.
B. By correlating exposed rock sections from around the world.
C. By systematically dividing all of earth history into equally spaced time intervals, similar to the hours and minutes on a clock.
D. By compiling religious and historical records to reconstruct Earth's history.
E. All of the answers listed here

Answer 1

A. By radiometrically dating successive intervals in rock layers.

Step-by-step explanation:

Scientist developed the geologic time scale by studying rock layers across the world, and classifying them according to their age, from youngest to oldest. In later years, radioactive dating helped determine the absolute age of the divisions in the geologic time scale.