Here's why:

* Relative age refers to the age of one rock or fossil compared to another, without specifying an exact numerical age.

* Statement A uses the principle of superposition, a fundamental concept in geology. Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom, and the youngest layers are at the top. This allows us to determine the relative ages of rocks based on their position in a sequence.

Statement B provides an absolute age (4.6 billion years) for the Earth's formation. Absolute age refers to the actual numerical age of a rock or fossil, determined by methods like radiometric dating.

Let me know if you have any other questions!