Question

what is the order of rock layers/structures from oldest to youngest? abcde cbade cbeda edcba

Explanation:

According to the principle of superposition in geology, in undisturbed sedimentary rock layers, the lower layers are older. Also, when there are intrusions (like D in the diagram) or faults (like E), the rock layers they cut through are older than the intrusion or fault.

• Layer C is the lowest, so it is the oldest.
• Layer B is above C, so B is younger than C.
• Layer A is above B, so A is younger than B.
• Intrusion D cuts through C, B, and A, so D is younger than A, B, and C.
• Fault E cuts through D, so E is the youngest.

Answer:

CBADE