Question

4 imagine that another layer of rock is found farther underground, beneath layer c1. what is true of this rock? a it is light gray or white in color b it is less than 20 million years old c it is between 60 and 65 million years old d it is more than 70 million years old

Explanation:

In geology, the principle of superposition states that in undisturbed rock layers, deeper layers are older than shallower ones. Layer C1 (the Cretaceous-Paleogene boundary layer) is ~66 million years old, so a layer beneath it must be older than this age.

Answer:

D. It is more than 70 million years old