The correct answer is 1. Law of Inclusion & Law of Superposition.
- The Law of Superposition states that in any undisturbed sequence of rocks, the oldest rocks are at the bottom and the youngest are at the top.
- The Law of Inclusion states that if one rock contains fragments (or inclusions) of another rock, the rock containing the inclusions is younger than the rock from which the inclusions came.
Both laws are used in geology to determine the relative ages of rock layers.