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Science slides #1

E

TermDefinition
Fossils The preserved remain of ancient living things
catastrophism The idea that conditions and organisms on earth, change in quick, violent events
uniformitarianism Geologic processes that occur today are similar to those that have occurred in the past
carbon film The fossilized carbon outline of an organism or part of an organism
mold The impression in a rock left by an ancient organism
cast Fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits
trace fossil The preserved evidence of the activity of an organism
paleontologist Scientist who study fossils
relative age The age of rocks and geologic features compared with other rocks and features nearby
superposition The principle that in undisturbed rock layers, the oldest rocks are on the bottom
inclusion A piece of an older rock that becomes part of a new rock
unconformity A surface where rock has eroded away, producing a break, or gap, in the rock record
correlation Matching rocks and fossils from separate locations
index fossils Species that existed on earth for a short length of time, were abundant, and inhabited many locations
absolute age To mean the numerical age, in years, of a rock or object
isotopes 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
half-life the time required for half of the parent isotopes to decay into daughter isotopes
Created by: columsad
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