Principle of Superposition causes the youngest layers to be on top.
Explanation:
Principle of Superposition states that when two or more waves having similar intensity and characteristics, intersect each other at the same point, some displacements occur as a result.
This displacement is equal to the sum of the displacements of both the waves.
The stratification of sedimentary rocks is based on the same principle. Thus, when two layers of soil come in contact, the younger soil layer deposit above the older one.
