Question

question 1 (multiple choice worth 2 points)
look at the four layers of rock shown below.
based on observations, it can be inferred that
layer d is the oldest and layer a is the youngest
layer c is the oldest and layer d is the youngest
layer d is the oldest and layer c is the youngest
layer a is the oldest and layer d is the youngest

Explanation:

In geology, the principle of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top. Layer D is at the bottom, so it is the oldest. Layer C is an intrusion that cuts through the other layers, and intrusions are younger than the rocks they cut through. Layer A is at the top - most position. So, Layer D is the oldest and Layer A is the youngest.

Answer:

Layer D is the oldest and Layer A is the youngest