Question

correlating rock layers means to match up rocks at different locations, based on their ________.

size

depth

age

Explanation:

Correlating rock layers (stratigraphic correlation) is done to match rock layers from different locations. The key factor for this correlation is the age of the rock layers. Size of rocks can vary within a layer due to sorting processes, and depth can be affected by local tectonic activity or erosion, so they aren't reliable for correlation. Age (determined via methods like fossil content, radiometric dating, or relative dating principles) is the basis for matching layers across different sites.

Answer:

C. Age (assuming the options are labeled A, B, C as Size, Depth, Age respectively)