a geologist finds four layers of sedimentary rock. she determines that no geologic events have shifted the…

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.\nwhich statement about these layers is accurate?\na is older than b.\nb is older than c.\nc is younger than a.\nb is younger than d.

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.\nwhich statement about these layers is accurate?\na is older than b.\nb is older than c.\nc is younger than a.\nb is younger than d.

Answer

Brief Explanations:

This relies on the principle of superposition for undisturbed sedimentary rock layers: layers form from oldest at the bottom to youngest at the top. The order from youngest to oldest is A, B, C, D. Evaluating each option:

  • A is younger than B, so "A is older than B" is false.
  • B is younger than C, so "B is older than C" is false.
  • C is older than A, so "C is younger than A" is false.
  • B is above D, so B is younger than D, which is true.

Answer:

D. B is younger than D.