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Ch6 Mr.Lucy

QuestionAnswer
uniformitarianism a principle that geologic processes that occurred in the past can be explained by current geologic processess
catastrophism a principle that states that geologic change occurs sudemly
palentology the scientific study of fossils
relative dating any method of determining whether an event or object is older or younger than other evnts or objects
super position a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
geologic column an orderd arrangement of rock layer that is based in the relative ages of the rocks and in which the oldest rocks are at the bottom
uncomformity a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
absolute dating any method of measuring the age of an event or object in years
isotapes an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
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
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
fossil the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
trace fossils a fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment
mold in biology, a fungus that looks like wool or cotton
cast a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
index fossils a fossil that is used to establish the age of a rock layer because the fossil is distinct, abundant, and widespread and the species that formed that fossil existed for only a short span of geologic time
geologic time scale the standard method used to divide Earth's long natural history into manageable parts
eons the largest division of geologic time
eras a unit of geologic time that includes two or more periods
periods in geology, a unit of geologic time that is longer than an epoch but shorter than an era
epochs a subdivision of geologic time that is longer than an age but shorter than a period
extinction the death of every member of a species
Created by: sahil2020
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