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a principle that states that geologic processes that occured in the past can be explained by the current geologic process
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a principle that states that geologic changes occurs suddenly
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a principle that states that geologic processes that occured in the past can be explained by the current geologic process uniformitarianism
a principle that states that geologic changes occurs suddenly catastrophism
the scientific study of fossils paleontology
any method of determining whether an event or object is older or younger than other events or objects relitive dating
a principle that states that younger rocks lie above older rocks if the layers have not been disturbed superposition
an arangement of rock layers in wich the oldest rocks are at the bottom geologic column
a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time unconformity
any method of measuring the age of an event or object in years ablolute dating
an atom that has the same number of protons as other atoms of the same elements isotope
the process in which a radioactive isotope tends to break down radioactive decay
a meathod of determining the age of an obect radiometric dating
the time needed for half of a sample of radioactive substence to undergo radioactive decay half life
the trace of an organism that lived long ago fossil
a fossilized mark that is formed in soft sediment trace fossil
a mark or cavity made in a sedimentary surface mold
a type of fossil that forms when sediments fill in the cavity cast
fossils of organisms that lived during a relatively short, well-defined geologic time span index fossils
is a scale that divides Earth’s 4.6 billion–year history into distinct intervals of time. geologic time scale
The largest divisions of geologic time eon
the Hadean eon, the Archean eon, the Proterozoic eon, and the Phanerozoic eon four eons
a peiriod of time era
the third-largest divisions of geologic time period
the fourth-largest divisions of geologic time. epoch
the death of every organism in a species extinction
Created by: riosjacob
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