1. Relative Age: This refers to the order in which rocks formed, without specifying a numerical age. It's determined by comparing the rock layers (strata) and using principles like superposition (older rocks are below younger rocks) and cross-cutting relationships (a rock that cuts through another is younger).
2. Absolute Age: This refers to the numerical age of a rock, typically measured in years. It's determined using radioactive dating techniques, which analyze the decay of radioactive isotopes within the rock.
