Question

The diagram below shows four layers of rocks.

Based on the observation of the rock layers, which of these inferences is correct?

A) Layer B is older than Layer C.
B) Layer A is older than Layer D.
C) Layer C is older than Layer D.
D) Layer B is older than Layer D.

Answer 1

Assuming that the red is magma, I would say it is A since new material moves away from the creation zone.

Answer 2

Answer:

Option (A)

Explanation:

According to the law of Superposition, the rocks that are present at the bottom of a rock sequence are considered as the older rock, and those that are at the apex are considered as the younger rocks.

Again, according to the law of Cross-cutting relationship, when the layers of a rock sequence are intruded by a hot magma, then the intrusive magma body is considered to be younger than the rock layers, because the rock layers were deposited initially, and after that these layers are intruded by a hot magma body.

So, from these data, we can conclude that the layer B is much older than the layer C.

Thus, the correct answer is option (A).