Question

the diagram below represents cross sections of three rock outcrops approximately 100 kilometers apart. what would be the best method of correlating the rock layers of each outcrop?
a
b
c
comparing index fossils
comparing mineral composition
comparing rock types
comparing thickness of rock layers

Explanation:

Index fossils are used to correlate rock layers across different locations. They are widespread geographically and existed for a short geological time. Comparing mineral composition, rock types, or thickness of rock layers may not be reliable as these can vary due to local geological processes.

Answer:

comparing index fossils