Question

10.) a geologist finds four layers of sedimentary rock. she determines that no geologic events have shifted the layers. she labels the layers a, b, c, and d from the top to the bottom. circle which statement about these layers is accurate. a c is younger than a b b is older than c c a is older than b d b is younger than d

Explanation:

In sedimentary rock layers, the principle of superposition states that in an undisturbed sequence, the oldest layers are at the bottom and the youngest are at the top. Given layers A, B, C, D from top - to - bottom, A is the youngest and D is the oldest. Option A which says A is older than B is incorrect. Option B which says B is older than C is incorrect. Option C which says C is younger than A is incorrect. Option D which says B is younger than D is correct as B is above D.

Answer:

D. B is younger than D