Question

3/10
how do you identify the oldest rock layer?
by finding the layer with the most fossils
by looking at the topmost layer
by identifying the bottommost layer
by matching the colors of the rocks

Explanation:

The principle of superposition in geology states that in undisturbed sedimentary rock layers, the oldest layers form first and are deposited at the bottom, with younger layers on top. Options about fossil quantity, top layers, and rock color do not reliably indicate the oldest layer.

Answer:

By identifying the bottommost layer