geology - the study of the origin, history, and structure of the Earth, Law of Superposition - The top rock layer and its fossils is the youngest and the bottom is the oldest. If the layers have not been disturbed, Unconformity - A break In the Geological record created when rock layers are eroded or when sediment is not deposited for a long period of time., fault - a crack in the earth's crust, usually along a lithospheric plates boundary, relative dating - any method of determining whether an event or object is older or younger than other events or objects, absolute dating - any method of measuring the age of an object or event in years, index fossil - a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found., radiometric dating - the process of measuring the absolute age of geologic material by measuring the concentrations and radioactive isotopes and their decay products., transitional fossils - fossils that provide patterns of evolutionary change from the early ancestors to modern life forms., ice core - a long cylinder of ice obtained from drilling through ice caps or ice sheets: used to study past climates.,

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