Which phrase describes the relative age of a rock?
A. uses the law of superposition to determine which rock is older or younger
B. can determine the age based on location of a rock within the same layer
C. requires only one rock to determine the age
D. can provide the exact age of a rock

A. uses the law of superposition to determine which rock is older or younger

Explanation:

Relative age refers to the age of the rock when compared to other rocks. The law of superposition was developed by Nicholas Steno. In this process, you determine which rock layer is older or younger in terms of the sequence they were laid out or layers were formed. This law states that the lower the layer, the older the rock layer is as compared to those on top of it.

it's A, i'm pretty sure

Explanation:

a. i. only is correct.