Stack #200756
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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
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| a principle that states that geologic changes occurs suddenly | catastrophism
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| the scientific study of fossils | paleontology
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| any method of determining whether an event or object is older or younger than other events or objects | relitive dating
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| a principle that states that younger rocks lie above older rocks if the layers have not been disturbed | superposition
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| an arangement of rock layers in wich the oldest rocks are at the bottom | geologic column
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| 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
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| any method of measuring the age of an event or object in years | ablolute dating
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| an atom that has the same number of protons as other atoms of the same elements | isotope
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| the process in which a radioactive isotope tends to break down | radioactive decay
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| a meathod of determining the age of an obect | radiometric dating
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| the time needed for half of a sample of radioactive substence to undergo radioactive decay | half life
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| the trace of an organism that lived long ago | fossil
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| a fossilized mark that is formed in soft sediment | trace fossil
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| a mark or cavity made in a sedimentary surface | mold
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| a type of fossil that forms when sediments fill in the cavity | cast
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| fossils of organisms that lived during a relatively short, well-defined geologic time span | index fossils
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| is a scale that divides Earth’s 4.6 billion–year history into distinct intervals of time. | geologic time scale
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| The largest divisions of geologic time | eon
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| the Hadean eon, the Archean eon, the Proterozoic eon, and the Phanerozoic eon | four eons
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| a peiriod of time | era
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| the third-largest divisions of geologic time | period
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| the fourth-largest divisions of geologic time. | epoch
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| the death of every organism in a species | extinction
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