Question

select the correct answer.
in this drawing, which layer of rock is the oldest?
diagram of rock layers 1–6 with fossils (armored fish, trilobite), dike, and trees
options:
a. layer 1
b. layer 2
c. layer 5
d. layer 6

Explanation:

In geological principles, the law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and younger layers are on top. Here, layer 1 is the bottom - most layer among the given options, so it should be the oldest.

Answer:

A. layer 1