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:

To solve this, we use the principle of superposition (a key concept in relative dating for rock layers). The principle of superposition states that in undisturbed rock layers, older layers are below younger layers. So layer A is below layer B, meaning layer A is older than layer B. If layer B is 3.5 million years old, layer A must be older (e.g., 4 million years old, depending on typical age estimates for such contexts, but the first dropdown is about the principle, likely "law of superposition" or similar, and the second is an age older than 3.5 million, like 4 million or more).

Answer:

First dropdown: Law of Superposition (or similar principle of superposition - based option)
Second dropdown: A value greater than 3.5 million years (e.g., 4 million years old, depending on options; if options include like "4 million", that would be correct)