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14 Cards in this Set
- Front
- Back
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absolute age
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specific of a rock or fossil
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fossil
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remain or trace, of a living thing that lived long ago
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relative age
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age of an abject compared to the age of another abject
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carbon 14
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Also called carbon 14. a radioactive isotope of carbon with mass number 14 and a half-life of about 5730 years: widely used in the dating of organic materials.
any radioactive isotope of carbon. |
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cenozoic
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beginning 65 million years ago and characterized by the beginning of mammals.
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eon
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the largest division of geologic time, comprising two or more eras.
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half life
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Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.
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geological time scale
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The scientific study of the origin, history, and structure of the earth.
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bed rook
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botton layer oldes rock
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epoch
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several divisions of a geologic period
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index fossil
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fossil used to help the relative age of a rock layer
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jurassic
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pored of a abundant time
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radioactive actives
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elements are radioactive as they were down you measure their relative age
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trilobites
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sea animals with shells
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