Petrified fossil - A fossil formed when minerals replace all or part of an organism, half-life - length of time required for half of the radioactive atoms in a sample to decay, Paleontologist - A scientist who studies fossils, absolute dating - any method of measuring the age of an object or event in years, fault - a crack in the earth's crust, usually along a lithospheric plate boundary, 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., Geology - the study of the origin, history, and structure of Earth, ice core - A long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates., Igneous - a type of rock that forms from the cooling of molten rock at or below the surface, Metamorphic - Rocks that undergo a physical change due to extreme heat and pressure,

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