Question

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

Explanation:

The law of superposition is used to determine relative ages of rocks. It states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top. Relative age only tells which rock is older or younger compared to another, not the exact age. Determining age based on location within the same layer doesn't define relative age, and relative - age comparison requires at least two rocks.

Answer:

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