Question

units a, b, c, d, and e are sedimentary rock layers. the thick dark line is a fault, and the unit labeled \granite\ is an intrusion. questions 42 - 44 refer to this cross - section. in the cross - section above, we know layer b is older than layer a because of the principle of a) cross - cutting relations b) inclusions c) superposition d) fossil succession

Explanation:

The principle of superposition states that in an undisturbed sequence of sedimentary rocks, the oldest layers are at the bottom and the younger layers are on top. Since layer B is below layer A, by the principle of superposition, layer B is older.

Answer:

C. superposition