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Clues to earths past

Vocabulary

TermDefinition
fossils are the preserved remains or evidence of ancient living things.
catastrophism is the idea that conditions and organisms on earth change in quick,violent events.
uniformitarianism states that geologic processes that occur today are similar to those that have occurred in the past.
carbon film is the fossilized carbon outline of an organism or part of an organism.
mold is the impression in a rock left by an ancient organism.
cast is a fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits.
trace fossil is the preserved evidence of the activity of an organism.
paleontologist scientist who study fossils .
relative age is the age of rocks and geologic features compared with other rocks and features nearby.
superposition is 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 is a surface where rock has eroded away,producing a break,or gap,in the rock record.
correlation matching rocks and fossils from separate locations.
fossils represent species that existed on earth for a short length of time,were abundant,and inhabited many locations.
absolute age to mean the numerical ,in years,of a rock or object.
isotopes are atoms of the same element that have different numbers of neutrons.
radioactive decay is the process by which an unstable element naturally changes into another element that is stable.
half-life is the time required for half of the parent isotopes to decay into daughter isotopes
Created by: kailanih
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