According to the principle of superposition, where would the oldest sedimentary rock layers be located?

• A. At the top
• B. In the middle
• C. At the bottom
• D. Dispersed throughout

Answer: (C)

The principle of superposition states that in any layered sedimentary rock sequence, the oldest layers are found at the bottom while the younger layers are deposited on top of them over time. This principle is fundamental to understanding geological formations and helps geologists determine the relative ages of rock layers.

As sediments accumulate, they compact and harden into rock, with each new layer being deposited over the previous layers. Thus, the oldest sedimentary rocks will always be those that were laid down first, positioned at the bottom of the sequence. This provides a clear framework for interpreting the geological history of a region and understanding the chronological order of events that have shaped the Earth.