Supersposition - Oldest layer on bottom, youngest on top, Intrusion - Magma moving through layers, Igneous - Rock that forms when magma intrusion cools, Fault - A large crack in rock layers that shifts them, Unconformity - Missing time in rock layers, Erosion - Process that erases time rock layers, Principle of Crosscutting - Intrusions and faults form after rocks layer, Law of Original Horizontality - All rock layer originally form flat/horizontal, Index fossil - Fossil that helps identify the relative age of rock layers, Abosolute age - An exact number associated with a rock or material, Uniformitarianism - The idea that earth had similar processes in the past as today, Relative age - An approximate age of events in geologic history based on clues in the rocks,

Relative Age of Rocks

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