Question

the image shows sedimentary rock layers with index fossils and a fault. which statement accurately describes the rock layers? layer 8 is older than layer 1. layer 3 is younger than layer 6. layer 4 and layer 10 are the same relative age. layer 2 and layer 9 are the same relative age.

Explanation:

Index fossils are used to determine the relative age of rock layers. If two rock layers contain the same index fossil, they are of the same relative age. Looking at the image, layer 2 and layer 9 have the same index fossil (the shell - shaped fossil).

Answer:

Layer 2 and layer 9 are the same relative age.