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unit 7

QuestionAnswer
uniformitarianism A principle that geologic processes that occured in the past can be explained by current geologic processes
fossil The trace or remains of an organism that lived long ago most commonly preserved in sedimentry rock
trace fossil A fossil structure such as a footprint or a croprolite that formed in sedimentry rock by animal activity on or within soft sediment
climate The weather condition 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 determing 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
unconformity A break in geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
geologic column An ordered arrangement of rock layers that is based on the relative rocks ages of rocks 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 tend 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 radioactive isotope to break down radiation decay to form a daughter isotope
radiometric dating A method of determining the absolute age of an object by comparing relative percentages of a radioactive parent isotope and a stable daughter isotope
Created by: Emanuel Barraza
 

 



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