Final answer:
The law of superposition is the most helpful in identifying the sequence of events in cross sections because it allows geologists to determine the relative ages and order of events in rock layers.
Step-by-step explanation:
The law of superposition is the most helpful in identifying the sequence of events in each of the three cross sections. This law states that in layers of horizontal sedimentary rocks, the oldest rock layer is at the bottom, and the youngest is at the top. By applying this law, geologists can determine the relative ages of different rock layers and the events that occurred.
For example, in the cross section, if there is a layer of sedimentary rock that is above another layer, we can infer that the layer below was deposited first, making it older than the layer above it. This helps us establish the order of events.
The law of superposition is especially useful in cross-section analysis because it provides a simple and clear way to determine the relative ages and sequence of events in a geological formation.