Question

the images show sedimentary layers before and after they were shifted by a geologic event. after the geologic event, which layer is the oldest? layer a layer b layer c layer d before geologic event after geologic event

Explanation:

In sedimentary rock - forming processes, the principle of superposition states that in an undisturbed sequence of sedimentary layers, the oldest layer is at the bottom. Even after a geologic event that shifts the layers, the original order of deposition determines the relative age. Layer A was originally at the bottom before the shift and remains the oldest.

Answer:

A. layer A