Geologists use tools other than the law of superposition to help them with relative dating. Which statements describe those tools? Check all that apply. An unconformity is created when lava pours out on Earth’s surface. Faults are the result of volcanic activity. Intrusions and extrusions are sedimentary formations. Cross-cutting features are always younger than the surrounding rock. When material erodes before sediment is deposited on it, a geologic gap results.