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Chapter 10

TermDefinition
fossil the preserved remains or evidence of ancient living things
catastrophisim The idea that conditions and organisms on earth change in quick,violent events
trace fossil the preserved evidence of the activity of an organism
uniformitarianism states that geologic processes that occur today are similar to those that have occurred in the past
mold The impression in a rock left by an ancient organism
carbon fill the fossilized carbon outline of an organism or part of an organism
cast a fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits
paleontologists scientists who study fossils
absolute age the numerical age in years of a rock or object
unconformity A surface where rock has eroded away, producing a break or a gap in the rock record
inclusion A piece of an older rock that becomes a part of a new rock
correlation matching rocks and fossils from separate locations
superposition the principal that in undisturbed rocks layers the oldest rocks are on the bottom
relative age the age of rocks and geologic features compared with other rocks and features nearby
half life the time required for half of the parent isotopes to decay into daughter isotopes
isotope Atoms of the same element that have different numbers of neutrons
radioactive decay the process by which an unstable element naturally changes into another element that is stable
Created by: AngelaWalker
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