Answer:
H, D, G, B, A, F, C, E, I
Step-by-step explanation:
H is the oldest, because it's on the bottom. Then layers D, G, and B were laid in that order. Then A, the fault line, cracked all layers. F was erosion that occurred after the fault, because it's even. Then layer C, then E, then erosion of E before I was laid last.