Geology - the study of the origin, history, and structure of Earth, The 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 geologic 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 plate boundarys DNA altered or modified in some way through genetic engineering., 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 of radioactive isotopes and their decay products, Ice Core - A long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates.Any fuel that is derived from biomass—that is, plant or algae material or animal waste., Igneous Intrusion - magma cutting through formed layers of sedimentary rock that then cools and hardens,

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