Final Answer:
The principle to interpret relative ages is 2) A geologic feature is older than any rock or feature it crosscuts. (Option 2)
Step-by-step explanation:
The principle of cross-cutting relationships is a fundamental concept in geology for interpreting relative ages of rock layers and geologic features. According to this principle, if a geologic feature, such as a fault or intrusion, cuts across another rock layer or feature, it is younger than the rock it disrupts. This principle helps geologists establish the sequence of events in Earth's history, allowing them to deduce the relative ages of various geological formations.
For example, if a fault cuts across a layer of sedimentary rock, the fault must be younger than the sedimentary rock it displaces. Similarly, if an igneous intrusion crosscuts a sequence of sedimentary rocks, the intrusion is younger than the sedimentary rocks. The principle of cross-cutting relationships provides crucial insights into the chronological order of geological events, enabling scientists to construct a timeline of Earth's history and understand the dynamic processes that have shaped the planet over time.
In summary, the principle that a geologic feature is older than any rock or feature it crosscuts serves as a valuable tool for geologists to decipher the relative ages of Earth's geological formations. By carefully observing the relationships between different rock layers and features, scientists can piece together the chronological sequence of events in Earth's geological history.(Option 2)