Question

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a geologist studying a cliff finds that the oldest rock layer is on top of the youngest rock layer. what is the best explanation for this arrangement?
a gap in the rock record was created by widespread erosion.
the rock layers were flipped upside down by extreme pressure.
new rock layers were deposited very quickly on an old surface.
the rock layers were bent but remained in their original order.

Explanation:

In geology, the principle of superposition states that in undisturbed rock layers, oldest layers are at the bottom. When oldest layers are on top, it means the layers were overturned. Extreme pressure from tectonic forces can fold and flip rock strata completely upside down, reversing the original order. Erosion creates gaps (unconformities) but does not flip layers; rapid deposition adds new layers on top, keeping old layers below; bending layers maintains original age order just in a curved form.

Answer:

The rock layers were flipped upside down by extreme pressure.