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15 Cards in this Set
- Front
- Back
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rapid diversification of most major animal groups during the Paleozoic era
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Cambrian explosion
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explains the eukaryotic calls may have evolved from prokaryotic cells
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endosymbiont theory
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a large division of earth's geologic time scale that is farther divided into one or more periods
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era
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preserved evidence of an organism, often found in sedimentary rock, that provides evidence of past life
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fossil
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model showing major geological and biological events in earth's history
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geologic time scale
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amount of time required for half of a radioactive isotope to decay
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half-life
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layer of iridium-rich material between rocks of the cretaeous period and rocksof the paleogene period that provides evidence of a meteorite impact
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K-T (K-Pg) boundry
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states that the oldest layers of earth's rocks are found at the bottom and the youngest layers of rock are found at the top of a formation if the rock layers have not been disturbed
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law of superposition
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scientists who study fossils
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paleontologist
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subdivision of an era on the geologic time scale
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period
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geologic theory of earths surface is broken into several huge plates that move slowly on a partialy molten rock layer
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plate techtonics
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method used to determine the age of rocks using the rate of decay of radioactive isotopes
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radiometric dating
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method used to deermine the age of rocks by comparing the rocks with younger and older rocks layers
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relative dating
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idea that life arises from nonliving things
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spontaneous generation
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states that only living organisms can produce other living organisms
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theory of biogenesis
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