Question

the diagram above shows part of a geologic rock layer cross section.
rock layer b formed 100 million years old
rock layer z formed 150 million years old
rock layer h formed 300 million years old
which of the assumptions can be made about the rock layers in the diagram above?
rock layer a could have formed 50 million years ago.

Explanation:

To determine the validity of the assumption about Rock layer A, we analyze the relative ages of the rock layers. The principle of cross - cutting relationships and superposition helps here. Rock layer H is 300 million years old, layer Z is 150 million years old, and layer B is 100 million years old. Rock layer A appears to be related to the formation that includes H. Since H is 300 million years old, and A is associated with the same geological event or period as H (from the cross - section), a formation age of 50 million years ago for A is inconsistent with the older age of H. So the assumption that Rock layer A could have formed 50 million years ago is incorrect.

Answer:

The assumption that "Rock layer A could have formed 50 million years ago" is incorrect.