ASBOG Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The choice indicating that units occurring concentrically around the bases of hills are older and deeper is accurate due to geological processes such as erosion and sedimentation. As sedimentary layers are formed over time, older strata become buried by newer materials, leading to a characteristic pattern where the youngest deposits are found at the surface and the older layers are located deeper down.

As erosion takes place, particularly at the flanks of hills, it often exposes these older, deeper formations. The concentric arrangement around hills is typically a result of the geological layering process where sediments accumulate in a bowl-like fashion. Consequently, the age and depth correlation aligns with geological principles that dictate how landforms and sedimentation processes work over extended periods.

The other options suggest attributes that do not accurately reflect the nature of stratification around hill bases. Newer and shallower units would be found at the surface rather than concentrically around the bases. Younger and less complex units would also refer to upper layers rather than those that are deeper, which typically exhibit more geological complexity due to the cumulative processes of sedimentation and tectonics. Lastly, the mention of units being more fragmented and saturated does not apply universally in the context of concentric layers, as they generally represent more stable depositional environments. Thus