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17 Cards in this Set
- Front
- Back
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Fossil
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any preserved evidence of an organism
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Paleontologist
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a scientist who studies fossils
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Relative dating
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method used to determine that age of rocks by comparing them with those in other layers
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Law of superposition
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states that younger layers of rock are deposited on top of older rocks.
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Radiometric dating
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uses the decay of radioactive isotopes to measure the age of a rock
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half=life
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the amount of time is takes for half the of the original isotope to decay
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geological time scale
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record of earths history
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Epcohs
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smallest units of geologic time
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periods
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divisions of geologic time consisting of two or more epochs
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era
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lasts hundreds and millions of years
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eon
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the longest unit of geologic time
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Cambrian explosion
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major animal groups diversified
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K-T boundary
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layer of material between the rocks of the Cretaceous period and the rocks of the Paleogene period
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Plate tectonics
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describes the movement of several large plates that make up the surface of the earth
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Spontaneous generation
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the idea that life arises from non-life
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Theory of biogenesis
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states that living organisms can only be produced by living organisms
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Endosymbiont theory
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the ancestors of eukaryotic cells lived in association with prokaryotic cells
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