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14 Cards in this Set
- Front
- Back
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A species that does not have any living members is said to be... |
extinct |
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Organisms that have been preserved in ice, tar or sap |
preserved remains |
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Theory that evolution occurs very slowly |
gradualism |
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Type of fossil that forms when an empty space is filled with minerals that harden in the shape of the organism |
cast |
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Type of fossil that forms when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part |
mold |
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Fossils that form when minerals in water soak into the remains and replace them, changing them to rock |
petrified fossils |
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The preserved remains or traces of an organism that lived in the past |
fossil |
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Particles of rock and soil |
sediment |
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rock formed when layers of sediment harden over millions of years |
sedimentary rock |
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a technique used to determine which fossil is older by looking at the layer of earth they are found in |
relative dating |
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the time it takes for half of a radioactive element's atoms to decay |
half-life |
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The millions of fossils that scientists have collectd |
fossil record |
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hardened sap |
amber |
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Theory that evolution occurs during short periods of rapid changes |
punctuated equilibra |
