Geologic Time Scale - Earth's history is organized by events and represented on this., Paleozoic - Means old or ancient life. Marked by the biggest extinction event in Earth's history., Mesozoic - Means "Middle Life" End marked by many extinctions including dinosaurs., Cenozoic - Means "recent life" based on fossil records that are relatively complete and easily accessed., Relative Age - The age of an object in relation to the ages of other objects., Uniformitarianism - The principle that Earth's history can be explained by current geologic processes., Absolute Age - Measure of age in time; seconds, minutes, years., Law of Superposition - A sedimentary rock layer is older than the layers above it, and younger than the layers beside it., Law of Crosscutting - A fault or body of rock is younger that any other body of rock it cuts through., Nonconformity - A gap occurs between a sedimentary overlying a non sedimentary rock., Angular unconformity - A gap in the rock record occurs between a sedimentary rock overlying folded or uplifted rock layers. Folded or tilted rock comes to the surface, erodes, and new sediment is deposited., Disconformity - Horizontal layers of old sedimentary rock erode, then get covered by new layers., Deposition - Accumulation or build up of sediments., Erosion - Natural forces like wind or water that can cause breaks in the geologic record., Bedding Plane - The boundary between two sedimentary rock., Half Life - The amount of time it takes for one-half of the atoms of a sample of the radioactive element to decay.,

Fossils, Relative Dating, and Geologic Time Scale

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