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Unit 7

Earth History

QuestionAnswer
uniformitarianism A principle that geologic process that occurred in the past can be explained by current geological processes.
fossil The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
trace fossil A fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment.
climate The weather conditions in an area over a long period of time.
ice core A long period of climatic cooling during which the continents are glaciates repeatedly.
relative dating Any method of determining whether an event or object is older or younger than older 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 the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time.
fossil The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
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.
radiometric dating A method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope.
Created by: V.M
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