Question

when looking at layers of sediment, typically the layer at the bottom is the ______ layer of sediment.

a darkest

b oldest

c softest

d youngest

e hardest

f lightest

Explanation:

In sedimentary rock formation, the principle of superposition states that in undisturbed sedimentary layers, the oldest layers are at the bottom because new sediment is deposited on top of older layers over time. Options like darkest, softest, youngest, hardest, or lightest don't follow this geological principle related to sediment layer age.

Answer:

b. oldest