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123

Unit 7

TermDefinition
uniformitarianism the foundational geological principle that natural processes operating today—such as erosion, sedimentation, and volcanism—have operated throughout Earth's history at similar rates.
fossil the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
trace fossil ) a principle that states that younger rocks lie above older rocks if the layers have not been disturbed (
climate the weather conditions in an area over a long period of time
ice core a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates
relative dating any method of determining whether an event or object is older or younger than other events or objects
superposition ) a principle that states that younger rocks lie above older rocks if the layers have not been disturbed (
superposition ) a principle that states that younger rocks lie above older rocks if the layers have not been disturbed (
geologic column an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom
absolute dating any method of measuring the age of an event or object in years
radioactive decay the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
half-life the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
radiometric dating any method of determining whether an event or object is older or younger than other events or objects
Created by: Laylani colon
 

 



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