ASBOG Practice Exam

The law of superposition states that which layers of rock are found beneath younger layers?

1. Oldest layers

2. Youngest layers

3. Intrusive layers

4. Extrusive layers

The correct answer is: Oldest layers

The law of superposition is a fundamental principle in geology that pertains to the arrangement of sedimentary and volcanic rock layers. It states that in an undeformed sequence of sedimentary rocks, the oldest layers are located at the bottom, while the progressively younger layers are stacked above them. In the context of this principle, the correct answer accurately reflects that the oldest layers are found beneath the younger layers. This law is essential for understanding the relative ages of rock formations and helps geologists establish a chronological sequence of geological events. Knowing that the oldest layers are at the bottom provides insights into the earth's history, allowing for the reconstruction of past environments and geological processes. Other options, like intrusive or extrusive layers, do not specifically relate to the order of sedimentary layers as described by the law of superposition, making them less relevant in this context.