Sedimentary - Rock formed when layers of sediments were pressed and cemented together, Absolute Dating - Any method of measuring the age of an object or event in years, Paleontologist - A scientist who studies fossils, Extinction - A term that typically describes a species that no longer has any known living individuals., Radioactive - A spontaneous process in which unstable nuclei lose energy by emitting radiation, Half-life - Length of time required for half of the radioactive atoms in a sample to decay, Uniformitarianism - A principle that geologic processes that occurred in the past can be explained by current geologic processes, Radiometric Dating - The process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products, Eon - The largest division of geologic time, Fault - A crack in the earth's crust, usually along a lithospheric plate boundary,

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