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Earth II Vocabulary Words Law of Superposition: a basic law stating that any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest layer on the bottom. Relative Age: a comparison of age of a fossil organism, rock, or geologic feature based on which is older or younger than some other object or event. Relative Dating: Science of determining the relative order of past events without necessarily determining their absolute age. Absolute Age: true age of a rock or fossil, tells scientists the number of years ago a rock layer was formed. Absolute Dating: process of determining an age on a specific time scale in archaeology and geology. Radioactive Dating: technique used to date materials such as rocks or carbon. Unconformity: a discontinuity in rock sequence indicating interruption of sedimentation, commonly accompanied by erosion of rocks below the break.