Question

Which principle states that rock fragments in sedimentary layers must be older than the surrounding sediments?

A) Principle of inclusions
B) Principle of unconformity
C) Principle of cross-cutting relationships
D) Principle of superposition

Answer 1

D) Principle of superposition

Step-by-step explanation:

The principle of superposition, since there is no inversion of strata, tells us that the lower rock layers are older than the upper ones.

Answer 2

A) Principle of inclusions

Step-by-step explanation:

The principle of inclusions states that any rock fragments in a sedimentary layer must be older than the layer. For example, the cobbles in a conglomerate must have been formed before the conglomerate.