Answer:
superposition
Explanation:
Superposition may be defined as placement of certain things or bodies lying on top of the other or above. This same principle is used to determine whether the one sedimentary rock is older than the other. This principle is known as the principle of superposition.
According to this principle, the oldest sedimentary rocks lie at the bottom and the newly formed rocks are placed at the top of the layers of the undisturbed rock.
