Question

in this drawing, which layer of rock is the oldest? a. layer 1 b. layer 2 c. layer 5 d. layer 6

Explanation:

According to the principle of superposition in geology, in an undisturbed sequence of sedimentary rocks, the oldest layers are at the bottom. In the given diagram, layer 1 is at the bottom - most position.

Answer:

A. layer 1