Question

estimating the age of a rock layer
use what you know about relative dating to choose the
correct answers from the drop - down menus.
ethan determines that layer b is 3.5 million years old.
due to the, he can
estimate that layer a is years old.

Explanation:

According to the principle of superposition in relative dating, in undisturbed sedimentary rock layers, the lower layers are older than the upper layers. Layer A is below layer B. Since layer B is 3.5 million years old, layer A must be older than layer B.

Answer:

Due to the principle of superposition, he can estimate that layer A is more than 3.5 million years old.