Question

the diagram shows horizontal rock layers. which statement is accurate? layer c is younger than layer a. layer d has an older relative age than layer c. if a geologic event tilted these layers, layer b would no longer be the oldest. it is possible to determine the absolute age of layer c with the information given.

Explanation:

• For "Layer C is younger than layer A": According to the law of superposition (in undisturbed sedimentary rock layers, the lower layers are older), layer A is below layer C, so layer A is older than layer C. This statement is correct.
• For "Layer D has an older relative age than layer C": Since layer D is above layer C, by the law of superposition, layer C is older than layer D. This statement is incorrect.
• For "If a geologic event tilted these layers, layer B would no longer be the oldest": The law of superposition is based on the original horizontality of sedimentary layers. Even if tilted, the relative age (based on original deposition order) remains. Layer A is still the oldest. This statement is incorrect.
• For "It is possible to determine the absolute age of layer C with the information given": The diagram only shows relative positions (using the law of superposition - relative age). There is no radiometric dating data or index - fossil age calibration (to get absolute age). This statement is incorrect.

Answer:

Layer C is younger than layer A.