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Science

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
fossil   the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.  
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original remains   the unchanged fossilized remains of animals and plants.  
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ice core   a core removed form an ice sheet  
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relative age   The geologic age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.  
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index fossil   a fossil that is useful for dating and correlating the strata in which it is found.  
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absolute age   the true age of a rock or fossil.  
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half-life   the time taken for the radioactivity of a specified isotope to fall to half its original value.  
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uniformitarianism   the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.  
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geological time scale   a system of chronological measurement that relates stratigraphy to time,  
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