Question

In a rock-layer sequence that hasn't been disturbed, are older layers found on top of younger layers?

1) Yes
2) No
3) Cannot be determined

Answer 1

Older layers are found beneath younger layers in an undisturbed sequence due to the law of superposition, important for relative dating in geology and archaeology.

Step-by-step explanation:

In a rock-layer sequence that hasn't been disturbed, older layers are found beneath younger layers. The principle that explains this observation is known as the law of superposition, which is a foundational concept in the field of geology. According to this law, in undisturbed sedimentary rock layers, the oldest layers are at the bottom, and the layers become progressively younger as you move to the top.

So, in response to the student's question, the correct answer is: 2) No, older layers are not found on top of younger layers, they are found beneath them. This principle is essential for geologists when they perform relative dating of rock strata and is also used in archaeology for determining the sequence of human activity by examining the layers of sediment or artifacts found in a site.