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Earth Science Gr7

Chapter 10

TermDefinition
fossil the preserved remains or evidence of past living organisms
catastrophism the idea that conditions and organisms on Earth change in quick, violent events
uniformitarianism a principle stating that geologic processes that occur today are similar to those that occurred in the past
carbon film the fossilized carbon outline of an organism or part of an organism
mold the impression of an organism in a rock
cast a fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposit
trace fossil the preserved evidence of the activity of an organism
paleontologist scientist that studies fossils
relative age the age of rocks and geologic features compared with other nearby rocks and features
superposition the principle that in undisturbed rock layers, the oldest rocks are on the bottom
inclusion a piece of an older rock that becomes a part of a new rock
unconformity a surface where rock has eroded away, producing a break or gap, in the rock record
correlation a method used by geologists to fill in the missing gaps in an area's rock record by matching rocks and fossils from separate locations
index fossil a fossil representative of a species that existed on Earth for a short period of time, was abundant, and inhabited many locations
absolute age the numerical age, in years, of a rock or object
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
half-life the time required for half of the amount of a radioactive parent element to decay into a stable daughter element
Created by: carriel
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