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| term used to refer to a species that has died out and has no living members |
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| scientist who studies fossils |
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| method of determining the age of a fossil by comparing its placement with that of fossils in other rock layers |
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| distinctive fossil that is used to compare the relative ages of fossils |
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| method for determining the age of a sampe from the amount of a radioactive isotope to the nonradioactive isotope of the same element in a sample |
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| length of time required for half of the radioactive atoms in a sampe to decay |
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| timeline used to represent Earth's history |
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| major division of geologic time; usually divided into two or more periods |
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| division of geologic time into which eras are subdivided |
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| geologic processes, such as continental drift, volcanoes, and earthquakes, resulting from plate movement |
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