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annmarie finals 1

first science finals

QuestionAnswer
an atom that has the same number of protons but a diffrent number of neutrons Isotope
a unit of geologic into which eras are divided Period
a unit of geologic time that includes two or more periods Era
the death of every member of a species extinction
a subdivision of a geologic period epoch
a type of fossil that forms when sediments fill in the cavity left by a decomposed organism cast
the largest division of geologic time eon
the standard method used to divide the earth's long natural history into manageable parts geologic time scale
a mark or cavity made in a sedimentary surface by a shell or other body mold
a fossilized mark that is formed in soft sediment by the movement of an animal trace fossil
the remains or physical evidence of an organism preserved by geological processes fossil
any method of measuring the age of an event or object in years absolute dating
the time needed for half of a sample of a radioactive substance to undergo radioactive decay half life
a priciple that states that geologic change occurs suddenly catastrophism
the scientific study of fossils paleontology
an arrangement of rock layers in which the oldest rock are at the bottom geologic column
a priciple that states that younger rocks lie above older rocks if the layers have not been disturbed superposition
Created by: katniss everdeen
Popular Earth Science sets

 

 



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